While this is a crazy example, I have been in very similar kind of position (not $1T for a loop, though) and been worried about the strong motivation to get rid of me on certain N+364 day timelines. It didn't happen and I was treated quite honorably. I think if you want your acquisitions to go well, you don't do cheesy stuff like firing people to save money (when the integration is otherwise going quite well) or else your future acquisitions will be harder. People talk.

Usually you don't agree to contracts that let you be fired for the sorts of things that don't end up with you in court. Buyers, being reasonable, refuse to sign contracts where they can't fire you for being a criminal.

Because that's a trick that only works once for the buyer so you know they're not going to pull it. It may not even work that one time because you'll tie them up in court.