The obvious answer is he was the one Sam gave an opinion on. He was one of the people doing duplicate work (probably the first team). Sam said good things about him to his ally and bad things to another board member. There was a falling out between that board member and Sam and she spilled the beans.

one of the first members to quit was on a team that sounds a lot like a separate team that is doing the same thing as Ilya's Superalignment team.

"Madry joined OpenAI in May 2023 as its head of preparedness, leading a team focused on evaluating risks from powerful AI systems, including cybersecurity and biological threats."