@sozobe,
Yes, that is true. I do think, however, that there are a lot of coaches that, given the same teams Jackson had over his career, would have had those nine championships as well. No way to prove that, but he had the greatest winner of all time on his Bulls teams, and he had Kobe AND Shaq on his other championship teams.
As far as coaching in general, he's never had to build a shitty team into a winner. He's always been surrounded by supremely talented players. That's why I think his abilities are not at nearly the level that his record suggests.