I mean I dont know how you rationalize that being bad and being bad by design somehow lead to different results? What is the secret sauce in a planned tank that enables you to turn it around and assemble a championship winning team all of a sudden?
There have been countless teams that have plowed through the bottom for decades trying to find that guy, only to find that guy and end up then creating a team like the Sixers who are good but not good enough. Suggesting that none of them except the few you mentioned planned on finding that guy at the top of the draft (e.g. planned to tank) is preposterous.
Helll just for Duncan, the Celtics were damn impressive in their effort to get him. Also the Spurs tank for Duncan doesnt really count as their starting point was having a roster than got #2 seed in the West, after which they just got ravaged by injury and executed an opportunistic tank. Opportunistic tanks does sound familiar though..... but that is something you obviously strictly oppose here.
Orlando Magic have actually had 2 MVP level guys in Shaq and Howard (add prime Hardaway to that even) and never won the chip with any of them... Knicks with Ewing, Wolves with Garnett, Nuggets (and Knicks) with Carmelo few that come to mind who always fell short after getting that guy. The list goes on and on the more you think about it.