I find the "Don Nelson gave AJ the keys to a championship team" take hilarious. The Mavs talent peaked before AJ even became coach. That '03 team with Dirk, Nash and Finley in his prime was more talented than the '06 team that beat the Spurs. That '04 team with their Big Three plus Antawn freakin' Jamison coming off the bench might have been even better than the '03 team.
The '05 Mavs team wasn't very good and AJ got them to the second round. The '06 Mavs team was improved talent wise but not as talented as '03 or '04 and he got that team almost to a damn championship. That '06 Mav team was not that talented. JHo, Terry, Stackhouse and Harris? Pretty decent talent but championship talent? No way. If that Mav team had won the championship, I'd say they would have been the least talented championship team since the '79 Sonics.
The '06 Mavs were a very, very good team but talent wise, they should have really been about a 52-win team and out in the second round. Now compare that to '03 or '04 when the Mavs had two first ballot Hall of Famers and a number of talented players and it's no contest. But Nellie was such a gimmick coach that after about one playoff game, Pop had those Nellie Mavs figured out.
I'm not ready to close the book on the Mavs' championship aspirations because Dirk is as talented as anyone in the league but I don't think bringing in Carlisle and giving Cuban even more power is heading in the right direction. At the very least, AJ wasn't afraid to bump heads with Cuban. If Carlisle doesn't stand up for himself, that ship could sink fast.