I disagree that a Superstar has to be an elite defender as well.
Who will dispute that Dirk Nowitzki in his prime was not a superstar? He was never more than league average defensively.
Yet even in his prime he has never put up as many points per game as Isaiah is currently scoring.
Was Dirk good enough to win a championship by himself? No, he needed help. And he put it altogether when Tyson Chandler arrived and the Mavs won the title.
Just because you don't win the whole thing all by yourself doesn't make you not a superstar.
How many championships did KG, Ray Allen, and Paul Pierce win before joining together? Exactly 0.
How many did Lebron win before joining with Wayde and Bosh? 0.
IT is special. I can see why there are doubters. But he's done so much. I feel like he has proven himself and will prove himself again in the playoffs. Hopefully we can get that 3rd piece. I feel like we are on the cusp of building a contender and IT is a key piece of that jigsaw.
Offensively sure, but IT is not a very good defender. Both the eye test and advanced metrics tell you this. And five years of this level on offense without defensive improvement won't make him a superstar. It is IT's defense that will always keep him from the superstar level.