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Why Your Co-founders Make or Break Your Startup

Systematic fallout

Chronology
of
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Dated August 2017 — Entered into evidence May 2026

Greg Brockman’s Personal Diary

Ok so what do I really want?… We might succeed, truly. This is the only chance we have to get out from Elon.

While outwardly building a humanity-first nonprofit, OpenAI’s co-founder and president was privately calculating how to reach a $1 billion personal valuation, plotting the end of the foundational alliance.

September 2017

Fast forward. The technology succeeded, but the team’s internal rot festered. Ending up in a federal courtroom with Musk taking legal action.

Late April 2026

Federal Court Testimony

Elon Musk:

“I came up with the idea, the name, recruited the key people, taught them everything I know, provided all the initial funding… I was a fool who provided them free funding to create a start-up.”

By late 2023, the Chief Scientist had secretly spent a year compiling a 52-page dossier on his own CEO’s dishonesty. By May 2026, the facade completely collapsed in court.

November 16, 2023 — Entered May 2026

Text Message Exchange

Sam Altman:

“Can you indicate directionally good or bad?”

Mira Murati Former OpenAI CTO

“Directionally very bad.”

Sam Altman:

“Ok.”

In her May 2026 video deposition played for the court, Murati provided the context for this breaking point, testifying that Altman’s leadership had created absolute “chaos,” citing a manipulative pattern of “saying one thing to one person and completely the opposite to another person.” The day after this text was sent, the board fired him.

Federal Court via video deposition, played May 8, 2026

May 11, 2026

Federal Court Testimony

Steven Molo Musk’s Attorney

“You told the board that Altman ‘exhibits a consistent pattern of lying, undermining his execs and pitting his execs against one another.’”

Ilya Sutskever Former OpenAI Chief Scientist

“Yes.”

Steven Molo

“That was clearly your view at that time.”

Ilya Sutskever

“Yes.”

May 12, 2026

Federal Court Cross-examination

Sam Altman

“This whole ‘you can’t steal a charity.’ I agree you can’t steal it. Mr. Musk did try to kill it, I guess twice.”

Steven Molo

“Are you completely trustworthy? Do you always tell the truth?”

Sam Altman

“I believe I’m a truthful person.”

Steven Molo

“It wasn’t my question, sir.”

As a young adult, budding with ideas and romanticizing the startup life, a favorite genre of TV for me was startup shows like HBO’s Silicon Valley and Amazon’s Startup, among others. What did these shows have in common? They portrayed startup life as an unpredictable adventure that ranged between comical and life-threatening. But at the end of the day, it wasn’t necessarily about the destination, but the team.
This presents two problems:

  1. Focus. If startups are about giving solutions, and the focus is on doing something cool with buddies all the time, then what are you actually solving?
  2. Team. The same way a team can lead you to unimaginable success, it can lead you to unimaginable pain.

Moving away from often romanticized ideas and adventures of startup life, the themes of competence, trust, loyalty, and betrayal, value, and belief systems that form these storylines will also impact you heavily. And there’s no script writer to draft a happy or seemingly acceptable ending that makes the journey worth it. No, some journeys aren’t worth it. And the end doesn’t justify the means.

I’m sure you’ve heard of that popular proverb that says if you want to go fast, go alone; if you want to go far, go together. There’s value in teamwork. But this heavily assumes that it’s the right team.

Cofounders are meant to be partners who operate under the same vision you have and offer resources crucial to the venture you want to bring to life. However, this is a marriage of purpose.
Any misalignment that’s left unchecked is a ticket to divorce.

Why would you need a cofounder?

The only valid reason → as a force multiplier. To fill critical execution gaps, you cannot bridge by yourself.

If so, then why do you have cofounders?

Setting up teams to satisfy external requirements as opposed to internal needs is like a rushing into a marriage to a stranger, for optics. And you’re likely to experience at least one of the following kinds of cofounder archetypes.

  • The promiser: Highly enthusiastic and quick to volunteer, but they struggle with execution and capacity planning. While their optimism is great for team morale, their tendency to overcommit creates bottlenecks. To work with them effectively, you must implement strict accountability frameworks and translate their enthusiasm into clear, measurable deliverables.
  • The carte blanche founder: Highly ambitious but disconnected from early-stage financial realities. They operate under the assumption that resources are infinite, focusing on scaling or acquiring tools before validating the need. Working with them requires setting rigid budgets and tying every proposed expense directly to a clear, near-term ROI.
  • The panelist: Excellent at identifying flaws but reluctant to build the solutions. They often act more like a board member or an industry critic than an early-stage operator. To make this dynamic work, their analytical skills must be redirected from mere critique to active problem-solving, forcing them to own the solutions to the problems they point out.
  • The grafter: They might lack highly specialized expertise on day one, but they make up for it with extreme adaptability and a willingness to learn. They are the ultimate utility players. While they require patience and guidance early on, their resilience and work ethic often make them the operational backbone of the company in the long run.
  • The consultant: Highly strategic but hesitant to get their hands dirty. They provide excellent high-level frameworks but struggle with the messy, tactical execution required in the trenches. They need to be pushed out of the advisory seat and assigned direct, operational KPIs to ensure they are building, not just theorizing.
  • The face: Naturally charismatic and exceptional at networking, pitching, and customer-facing roles. While they are invaluable for fundraising and sales, they can easily become disconnected from the product’s reality. They must be continuously tethered to the operational team to ensure that what they are selling aligns with what is actually being built.
  • The newbie: Often battling imposter syndrome, they underestimate their own value and may initially hold back in strategic discussions. They require strong mentorship and an environment that builds their confidence. Once they find their footing, their fresh perspective and eagerness to prove themselves make them incredibly dedicated partners.
  • The MVP: The rare balance of strategic thinking and relentless execution. Whether technical or non-technical, they understand what the business needs at any given moment and deliver it reliably. They are self-managing, highly accountable, and adapt seamlessly to the unpredictable nature of startup building.

What do we learn? Personalities play a huge role in the success of a team where you’re expected to wear many hats. An imbalanced team is ripe for failure.

You don’t truly know who you’ve gotten into bed with. And so you go learning along the way. Quickly, it dawns on you that, as proficient as they are with their work, it’s the much-overlooked aspects like character that drive a wedge between you the most.

Technical brilliance cannot outrun a character deficit, as the consequences are legal and financial ruin at the very least.

Here are more examples of how poor character plays out in the boardroom:

The impulsive cofounder who publicly berates employees or snaps aggressively at investors during a stressful pitch. Their temper creates a toxic, fear-based culture, leading to high talent churn and blown funding opportunities. You eventually get trapped in their blast radius.

Steph Korey (Away Luggage)

These come in at least two ways;

The cofounder with a hidden agenda who does a bait and switch on the company’s foundational vision.

This creates a new cofounder archetype: The politician. Highly charming to the public and investors, but internally relies on manipulation to maintain control. They operate by information asymmetry…saying one thing to one person and the exact opposite to another.

Rather than leading through clarity, they consolidate power by pitting executives against each other and sowing deliberate chaos. Working with them means you are constantly double-checking their words against reality. This drains the team’s operational energy into internal politics.

Elon Musk vs. Sam Altman (OpenAI)

Musk alleges that once Altman and Greg Brockman used his money to build the technology, they thwarted that path—sneakily flipping the script, converting to a closed, for-profit model with Microsoft, and unjustly enriching themselves.

The cofounder who torpedoes a massive acquisition deal or a crucial enterprise partnership behind your back.

Driven by ego, jealousy, or a hidden personal agenda, they secretly kill the company’s biggest breakthrough right at the finish line.

Manish Maheshwari (Invact Metaversity)

The aesthetics-only cofounder. They are entirely enamored with the startup lifestyle:the networking events, the title, the aesthetic, but they lack a product roadmap, a customer acquisition strategy, or the grit to execute. A company cannot survive on a recreational atmosphere. Minus a concrete vision for solutions, the startup perishes.

Ja Rule & Billy McFarland (Fyre Festival)

As one of the most widely documented startup failures in modern history, Ja Rule was the ultimate aesthetics-only partner. He was entirely focused on the aesthetics—the supermodels, the Instagram marketing, and the luxury lifestyle pitch.

The cofounder who normalizes cutting ethical corners. It starts small, but soon they are faking user metrics, lying to VCs on due diligence, or misusing customer data. Their lack of integrity eventually corrupts the company’s baseline ethics and exposes you all to legal ruin.

Charlie Javice & Olivier Amar (Frank)

When a principled founder turns a blind eye to a toxic cofounder or employee simply because that person is a 10x developer, a top salesperson, or deemed too valuable to lose. By compromising your values to accommodate their character deficits, you pollute the entire company culture, making the well undrinkable for the rest of your team.

Sam Altman’s Reinstatement at OpenAI

By giving way to a documented pattern of deception to save their valuation, they soured the atmosphere of the organization, leading to a mass exodus of the company’s top safety researchers.

Uber’s early engineering culture

The financially reckless cofounder. The moment the seed funding hits the bank account, they burn through it on premature scaling, expensive PR retainers, or luxury software tools before the startup has even achieved product-market fit.

Domm Holland (Fast)

The unreliable partner in a crisis. Startups are a series of fires. When a major server crashes, a key client churns, or the runway drops to zero, this cofounder goes AWOL or crumbles under the pressure. You are left completely alone in the fight, proving that having the wrong partner is far more dangerous than fighting alone.

Antje Danielson & Robin Chase (Zipcar)

Based on the previous sections, you may be tempted to think that I’m against having cofounders. But I’m simply championing thoroughly evaluating the fitness of your prospective cofounders for the role.

When forming a team, focus on people you have something to learn from. And people who are willing to learn from you as well. Lessons don’t have to be limited to business. This is how you sharpen each other, not only as professionals, but as effective people. This also sets a healthy base for correcting and challenging each other.

Additionally, there’s a greater ROI from such a base. When the testing days in the life of your startup come (and they will), you need your warriors in your corner. When it’s all hands on deck, you need your team to be part of progress, and not a problem you need to add to the growing list of things to fix.

It’s wise to evaluate your prospective cofounder beyond their professional qualifications. Learn who they spend time with. The sentiments they share online. What they do in their free time. Get to know who you’re getting into bed with. Should you think this is an unnecessary step, boy oh boy, just wait for when your cofounder’s closet skeletons become yours by association. And the time, effort, and resources to be sunk into convincing other stakeholders that you had no idea, had no concerns, or no ties to such.

Simply, ascertain character. That’s what the world needs more of. Leaders of character. Skills change, requirements change, personalities shift. Character is an absolute; it’s either good or bad, and either side is infectious.

What brings you together? Why did you form your team? Evaluate why you’re coming together. Having a collective purpose that’s much greater than just making money is ideal. Remember, if it’s just money, that’s a pretty decent template for greed and distrust. We see internal contention for equity ever so often.

When the mission is just money, your stake in your entity becomes fair game for enriching someone. Internal politics end up overshadowing the purpose.


Here’s a simple team formation checklist to help you do a simple evaluation of prospective team members.

Team Strategy Framework

Cofounder Selection
Checklist

A clinical evaluation framework for prospective team members. Use this to determine if a candidate is a foundational asset or a long-term liability.

FORM REF: T-CSF-2026

EVALUATOR: __________________

SUBJECT: ____________________

Phase 01: The Optics vs. Utility Test

Operational Alignment
Are they joining to fill a critical internal execution gap, rather than just satisfying VC pattern-matching (e.g., the Mzungu-as-a-service trap)?
Are they willing to actually build and execute, rather than just critiquing from the sidelines?
Do they grasp early-stage financial reality, avoiding the Carte Blanche trap of burning runway on premature luxuries?
Make-or-Break Assessment

Phase 02: The Character & Contagion Audit

Does their personal track record protect your company from reputational contagion and toxic associations?
Do they maintain emotional control under stress, avoiding the hot-tempered outbursts that create a fear-based culture?
Do they operate with absolute transparency, refusing to cut ethical corners or fake metrics?

Phase 03: The Testing Days & Mutual Growth

Crisis Resilience
When a crisis hits, will they jump into the trenches to fix it rather than crumbling or going AWOL?
Are they anchored by a concrete product vision, rather than just the aesthetics and networking of the startup lifestyle?
Do you genuinely have things to learn from them outside of business, setting a healthy base for mutual correction?

Phase 04: Mission, Equity, and Ego

Long-term Governance
Is their commitment to creating impact and solving the core problem significantly stronger than their desire for a quick cash-out?
Do they operate entirely without hidden personal agendas, ensuring they won’t suddenly derail, thwart or sabotage the company’s destiny?
If the company’s survival eventually required it, would they rationally accept equity dilution or a title change without triggering a bitter internal war?

The Outcome Logic

Scenario A: Strategic Fit

All Yes: Proceed to drafting the co-founder agreement. You have found a true partner.

Scenario B: Operational Risk

1–2 “No”s in Phases 1, 3, or 4: Proceed with caution. Address specific operational gaps tightly in your vesting schedules (e.g., 1-year cliff).

Scenario C: Ethical Failure

Any “No” in Phase 2: Walk away immediately. You cannot legally contract your way out of a partner’s bad character.

The Zero Multiplier Effect

(
Phase 1
Utility
+
Phase 3
Crisis
+
Phase 4
Gov
)
×
Phase 02
Character

Operational skills are additive, but character is a multiplier. If character is compromised (0), the entire equation equals zero. High utility cannot compensate for a character deficit.

Tabiri ⚡ 2026

TEAM ALIGNMENT TOOL


“If you’re like, ‘Really, I’m gonna need a vacation to recover from my vacation,’ it might be the wrong choice.”

Daniela Amodei

Also, when circumstances like market fit, funding, and reputation change for the worse, if you can’t count on your team to weather it out, these expected tremors become a death knell for your venture, as mindsets shift to self-preservation of individuals.

However, with a genuine desire for impact, money becomes a by-product. And when circumstances, such as the aforementioned, change, the now doesn’t threaten the long-term goal. The project becomes much bigger than you and your founding team. It’s a reminder, a commitment, and a solid base for organizational culture that goes beyond the founding team to stakeholders, including the consumer.

“If you’re like, ‘Really, I’m gonna need a vacation to recover from my vacation,’ it might be the wrong choice.”

All the above solutions sound so doable when you’re in the team formation stage. But what happens when you suspect that the boat sailed and that you’re on the wrong team?

Evaluate your team through conversations. Exercise wisdom, of course. This isn’t an opportunity to arouse suspicion or trigger premature defensiveness. Test the current motivations, convictions, intentions, and alignments of your team. You may realize that they’re not the wrong team, but just a bit misaligned.

After talking, you’ve now determined that you’re in the wrong team. You have decisions to make at this point. Whether to retain the team, bin the team and start a new one, or leave the team and venture entirely.

All these decisions, aside from leaving the startup, assume that you have the authority to make such moves. Implement mechanisms that reward long-term vision (the carrot) and heavily penalize mediocrity or bad faith (the stick).

I am neither encouraging nor supporting mutiny, but founders must protect the entity.

Should you see it fit to retain the team, depending on your legal setup, get legal counsel on how to legally and ethically insert and amend clauses to reward commitment, character, and selfless long-term vision. Conversely, add those that punish lack of character, mediocrity, and a lack of ingenuity, as this is a founding team; some sort of a legal carrot and stick approach. Examples of these alignment structures are:

This is a standard defense mechanism. Founders do not get their equity upfront; they earn it over a standard schedule (typically 4 years).

  • Reverse vesting with a cliff: The cliff (usually 1 year) is the ultimate stick: if a founder leaves or is ousted before the 12-month mark, they walk away with zero equity. However, if they hit that 12-month mark, you’re vulnerable to founders executing what we’ll call a cliff-and-run, in which partners are comfortable looking elsewhere when they receive their stock options.
  • Milestone-based vesting: Instead of time-based equity, tie a portion of vesting to concrete execution goals (e.g., shipping the MVP, hitting revenue targets). This rewards actual ingenuity and penalizes those trying to critique from the sidelines.
  • Back-Loaded Vesting (The Amazon/Snap Model) Instead of vesting an equal 25% every year, back-loaded schedules heavily weight the equity toward the later years. A common structure is 10% / 20% / 30% / 40%. Why it works? If a co-founder tries to jump ship after Year 1, they only walk away with a measly 10% of their allocation. To get the real payoff, they are forced to stick around for years 3 and 4. It naturally repels the quick cash-out archetypes.

Why? I acknowledge that there are a variety of factors, but a major one is simply that competitors offered immediate, massive cash payouts.

Lesson? Quite stark. You can draft the tightest vesting schedules in the world, but if your partners aren’t aligned with you, the team will conform to market pressure.

These clauses define what happens to a founder’s shares if they exit. A good leaver (e.g., leaving due to illness or mutual agreement) might retain vested shares. A bad leaver (e.g., fired for fraud, gross negligence, ethical breaches, or going AWOL) forfeits both unvested and vested shares. This directly punishes character deficits.

If the team is completely deadlocked, this clause allows one founder to offer to buy the other’s shares at a specific price. The second founder must either accept the buyout or buy the first founder’s shares at that exact same price. It forces a swift, fair resolution to toxic team dynamics.

Keep in mind that contracts still cannot fix character. That’s a market reality. Legal architecture is mandatory, but it is not a cure-all for a misaligned team. Additionally, we’re in an age where fierce talent wars are the norm, especially for AI talent.

If neither the operational carrot nor the legal stick corrects the behavior, you cannot let the situation fester. A toxic or unproductive founder is a hole in your venture’s bucket (these holes are character, wisdom, vision, purpose, and belief systems, too), and that leak will eventually drain the capital, culture, and vision of the entire company.

A couple of clinical questions should dictate your next move: Setting sentimentality aside, is this specific venture worth the immense friction of cleaning house? Furthermore, do you possess the legal authority to actually do so?

If both answers are yes, consult your legal counsel on the most honorable, amicable, and airtight way to substitute the outgoing members. Candidly explain your position to the outgoing team. Meanwhile, you should have identified the replacements using the formation frameworks we’ve already covered. But it’s worth noting that exits are rarely as clean as they sound on paper; none of these should be unilateral decisions without legal backing.

If the answer is no—if the venture simply isn’t worth the trouble of defusing a ticking time-bomb of a team—you may be better off leaving and starting entirely afresh.

Never be afraid, discouraged, or embarrassed to walk away from a broken cap table. Your venture is not your life. It is simply a scalable expression of your capabilities and productivity. You can always build other scalable expressions, but you cannot build another life.

Alliances are the currency of the modern builder. Before seeking external alliances with investors or the market, ensure the internal ones that matter most are absolutely rock-solid.





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