Shivon Zilis just delivered the most damaging testimony yet in Elon Musk's case against OpenAI. Under oath yesterday, she revealed that Musk offered Sam Altman a Tesla board seat as part of a plan to merge OpenAI into Tesla.

The kicker? Zilis' own brainstormed notes from 2017 show Musk wanted OpenAI structured as a "B Corp subsidiary of Tesla" with Altman as the "anchor" for TeslaAI.

This completely contradicts Musk's lawsuit narrative. He claims he wanted OpenAI to remain a pure nonprofit. But his own adviser's notes show he spent months plotting to fold it into Tesla for profit.

According to CNBC's reporting on the testimony, the structure was debated "ad nauseam." Multiple for-profit options were on the table. Zilis even texted Altman in February 2018: "Did you think through a B Corp subsidiary of Tesla?"

The Verge called Zilis' notes "the trial's most important evidence." They show Musk brainstorming solutions that all involved building AGI at Tesla: either through a new Tesla AI lab, or by absorbing OpenAI entirely.

Zilis also revealed Musk wanted to stack OpenAI's board with his allies: herself, Sam Teller, and Jared Birchall. She wrote to Birchall about a funding freeze: "Unsure how this will impact negotiations."

The most revealing detail? Altman texted Zilis in 2023: "BTW, good idea for me to tweet something nice about Elon?" Even after the split, Altman was still managing the relationship.

This testimony destroys Musk's credibility. He's suing OpenAI for becoming for-profit, but his own notes show he wanted it for-profit from day one. Just under his control, not Microsoft's.

The irony is perfect. While Musk sits in court arguing about OpenAI's nonprofit mission, his own adviser's notes prove he never cared about the mission at all.