He just can't realize that. He have to humble himself if he wants to get in to a good team. He needs to adjust himself, it's sort of pride if he can't accept to himself that he had changed a lot for the past few years.
If he'll start showing humility to his teammates and the team itself, I think he'll be considered by teams who really are interested getting him.
That is the key. Humbleness. Being humble with synonyms of being respectful and submissive. If he could do that, then there wont be any problem for the team.
Would you think that Melo will be a good fit to the Golden State Warriors? He is open to any roles that will be given to him and with the Warriors he can be a second stringer where all he need is to run and shoot 3's as the defense of the Warriors is their offensive game.
He might. If he change his attitude. His problem there would be Green and it will happen just like what it did with Durant.
Maybe he could lead the 2nd team of GSW if he still want to be ball hog.
But there is still the necessity of following orders.
That doesn't even make sense. Why would the Heat even want to pay a guy like Carmelo millions if they're tanking? Or are you saying they need Carmelo to drag them down even further? 
