It's not that people think he's Shaq, it's that he thinks he's better than Shaq and he's not. Refusing help from Nash and multiple Lakers legends proves that.
To me, that was when I knew that he was unlikely to come back and when I was glad that he wouldn't be back, even though I knew that the Lakers were heading for some rough seasons because of it.
I don't care who a player is or who he thinks he is, when arguably the greatest center in the history of the game and one of the greatest shooters in the history of the game offer to help you to improve on glaring weaknesses in your game and your reply is "No thanks. I'm good" that's a problem. That's someone I wouldn't want on the Lakers.
People crack on Kobe for having a massive ego (and he does), but him asking great players like MJ for pointers on what they do and how they prepare, even in the middle of a game, shows that he was smart enough to humble himself in order to become a better player.
When one considers how good Dwight is just on his natural talent, it's scary to think about how good he could have been if he were willing to learn. He really could have been better than Shaq and just about everyone else too.