You and GG already commented on this, but if the rumor is true that Brandon knew that Buddy was being ushered out during the coaching search and even told Marrone that at the time, then leaving the decision up to the old codger on the exit slide pointed out to the street is, well, bordering on negligent. Of course, maybe Nix never bothered telling anyone in the organization that he was thinking of retiring nor was he forced out. But like GG said, there had been rumors on the street for months about Nix being out as the GM of football.
At any rate, successful organizations have buy-in. The football people work from the same playbook and everyone lines up facing the same goal post.