Someone lied to everybody and said he was a superstar: he believed it, coaches believed it, executives believed it, delusional Knicks fans believed it, heck half of the Coli believed it
Anybody with half a brain and looking at a 4th quarter of him playing in an NBA Playoff game could quickly come to the conclusion that he's an overhyped scorer with 0 leadership skills, no eye for the game (low basketball IQ, it's just rinse and repeat the same moves regardless of the situation, no way to appreciate the weight of situations) who can't take over a game or influence a team to do so.
Somebody lied.