It's quite possible that he wasn't the best fit, and that the board is an even worse fit. Judging by the behavior of the board, it's hard to see them being a good fit for the company.
I’m saying there is a reason this happened and 2/3 the board agreed. It needs to play out further for us to see if there is a problem here or not, honestly.
I find it hard to believe you can effectively muster a mandate worth of votes based on opinion alone
He convinced other members of the board that Sam was not the right person for their mission. The original statement implies that Ilya expected Greg to stay at OpenAI, but Ilya seems to have miscalculated his backing.
This appears to be a power struggle between the original nonprofit vision of Ilya, and Sam's strategy to accelerate productionization and attract more powerful actors and investors.