My view would be that the over achievers are Marc Jackson who did a great job along with Thibs (for obvious reasons) and Woodson who got NYK to play defense in a big way.
I think Popovich and yes Doc are great coaches but they didn't do anything special this year.
Hollins, McHale, and I guess Karl I would put in the next tier as they got a lot of bang for their buck with their teams, but just not quite as much as the top 3 I noted above.