Eh, you have pop, Carlisle, Jackson and everyone else. At some point you give the guy credit for sticking around. Not every coach has to be perfect to be one of the best. I'm not overating him. He'll be missed in the nba since you can't just replace a guy like that with a random assistant or college coach.
Fwiw, there are good coaches, trendy coaches, adequate coaches, and bad. That first category is so slim, that spending most of your time in one of the other two middle categories gets you into the hall of fame.