What he said is more or less true.
The liability is in BP's hands, not his personally.
I doubt anyone at BP will be found criminally negligent (for the simple reason that the decisions were made on the ground, and the risks were on the ground, and the people making the decisions were as qualified as anyone to make them, even if they were wrong).
Dude will be out of a job soon forsure, but he's not going to resign. (its called a severance package.)