I can see him getting butt hurt. I don't think he has any intention of going back to an assistants job in the NFL or college. He has made his bankroll with this job, he's old enough not to be interested in getting back into the grind, especially since the offset would mean he's working for free.If they fire him in-season, I think it gets acrimonious and he goes for all of what he is due. Nobody will touch him for an HC or OC job, so NFL position coach salary will not offset the buyout by a significant amount. If they let him go after the season, they can say that they gave him a full season with his staff and his players. Just wasn’t good enough. Need to win now.
We can hope that he is embarrassed enough to be willing to negotiate but I don't think at this point he cares and the cost of keeping him gets higher than the cost of getting rid of him.
RG and LC should be talking with him now about how he can leave with dignity instead of being fired.