And you keep bringing up PJ. You can't seriously think that:
1. The Spurs would demote/fire Pop after the 04-05 season
2. That the man who played in NY and coached in Chicago and LA would ever relocate to San Antonio.
But, let's remove the date limits anyway. I'll grant you that PJ and Riley are superior as coaches. Like PJ, Riley has spent his NBA life in LA, NY, and Miami. He wasn't ever coming to San Antonio, either.
You have repeatedly asserted that Pop's bad coaching has cost the Spurs multiple additional championships.
So beginning with Duncan's arrival in 1997, name a few coaches outside of PJ and Riley who would have led the Spurs to greater success in the Duncan era.