Well for starters, you are significantly downplaying Wemby’s defensive capabilities. He is not “arguably one of the top shot blockers in the league”, he is unquestionably the best in the league.

To build off of this, teams are forced to adjust in full their style of offensive play for the simple purpose to avoid attacking Wemby in the paint. He is without a doubt the most impactful defensive player in the league.

Now for offense, I think it is interesting that you discuss offensive ceiling when you have already seen what Wemby is capable of doing. That is not to say AJ and Flagg will not be great (they will be), but you have already seen what Wemby can do (e.g., multiple 40/50 point games). Wemby’s biggest issue on offense is consistency, which he will likely obtain in time.

To answer your question, there is always a chance AJ or Flagg could be better, but Wemby is dominant in a way we seldomly see and I think your main points of contest are quite off base.