One of the biggest things a coach (or any sort of leader) needs to be able to do is take control. You might have good players and be a good coach in every other respect, but if you can't be The Man in the eyes of the team, it's not gonna be pretty. Frankly, Turner Gill at KU is a good example of this: good guy, good coach, but he never really took control of his players and he was rightly fired for it. (Granted, KU is a good place to go if you want your career to die, but still.)