The biggest part of being a manager is to get your 25-40 players to come together as a team and respect you as a leader. Leyland has passed that with flying colors in his years here. We almost never have in house fighting which is a huge plus for him. A smaller part (but more visable part) is making moves in games. The reason I consider it smaller is because good teams can work around a few mistakes and still win. So does Leyland make it harder at times to win games? Yes. Are they so bad that the team can't win with him managing? No. Working all of those ego's is a very underrated thing that many managers are unable to do.
Yeah, because managing the bullpen has nothing to do with being a good manager. The daily lineups with Inge, Raburn, Santiago, and Brennan Boesch have nothing to do with managing. Putting DP DY at the 5 spot the entire season despite hitting into DP's constantly has nothing to do with managing.