Ego. He probably has Bill's ego except he didn't do anything to earn it. There's a reason why when Irsay whacked them he had nothing but great things to say about Bill and didn't say much of anything about Chris.
That's one of those things, people who hate Pioli will probably hate the Polians for the same reasons. Very controlling of information, probably even moreso than Pioli... and a bit condescending. But to his credit, there were times Bill made unpopular moves and turned out to be right. Not sure Pioli has done that once. Chris supposedly was the driving force in letting go the coaches and front office people the Colts lost over the last 4-5 years though.