He has built teams, how do you think he got the job coaching the Bulls.. do some research for a change. All the evidence shows that he is one of the greatest, and if he didn't have a true ability to coach a team, so as to be considered one of the greatest, why is it that the players he coaches have so much love for him.
I can understand your position, though. Coach leaves the team, players vanish, team falters. It's gotta be pretty tough, really.