The best you can hope for is for the CEO to have his incentives aligned fully with the company. Given his enormous ownership stake, that's already true. This is a rounding error compared to the billions of book value he lost and the billions he still retains.

Any CEO in his position is accountable by default. They lose a literal fortune when the company doesn't perform. This meme of "but how are you taking accountability" confuses the heck out of me given this context.