The fact that Mike D'Antoni and Flip Sauders are on that list and Scott Skiles is not renders it worthless. Skiles is the next Larry Brown.
But I'll critique it and add my own anyways...
First, Phil has rings because he's never coached a bad team. He quit and let Rudy T coach the Lakers when they were rebuilding. He's an above average coach, but grossly overrated. He's had two of the greatest ever (MJ and Pippen, Kobe and Shaq) on every championship team but one. Not even having Kobe on his team could get him out of the first round the first two years after he came back. He's not known for getting the best out of players, but rather picking players who fit in his style of play. He's a great "manager" but not a good "coach."
Pop is excellent, he and LB are the most proven in "coaching" their guys. Pop has always had a premier big man, but Patrick Ewing has told us that's not enough. The supporting cast Pop has set up has been a bunch of overacheivers every year. Manu was the next to last pick in the draft, TP was the 28th pick, he had guys like Bruce Bowen (undrafted, switched teams 4 times in 6 seasons before going to the Spurs), Nazr Mohammed, Stephen Jackson (out of the league for three years before the Spurs got him), etc. play way above expectations, and he is a genius for finding talent.
Let me put it this way, I'd be shocked if Alonzo Gee, Ian Mahimni, DeJuan Blair, George Hill, and Garrett Temple don't have 10+ year careers. On the other hand, I'd be surprised if DJ Mbenga, Luke Walton, Sasha Vujacic, Josh Powell, and especially Adam Morrison are playing 5 years from now.
So on that note, here are my top 10 active coaches
1. Gregg Popovich
2. Larry Brown
3. Jerry Sloan
4. Rick Adelman
5. Don Nelson
6. George Karl
7. Scott Skiles
8. Phil Jackson
9. Stan Van Gundy
10. Mike Woodson
Honorable Mention: Scott Brooks, Alvin Gentry (both will probably be on the list soon), Rick Carlisle, Nate McMillan, and Erik Spoelsta.
Oh, and Swedd: there are only 30 teams in the Association...