Its either his way or no way. If he doesn't have complete control over things its wrong and hardly ever takes other points into consideration. If I recall correctly, Fischer did that to his DC in 2001 before the season ever started!
Its also hard for someone who was a head coach for9 years to all of a sudden take a step down. But knowing both gentlemen when they were both assistants there back in the 90's, it probably goes further up than just the hd fb coach.