One thing to consider though is that Howard is not McGee in terms of movement and willingness to take rolls. I bet Javale doesn't mind whatever type of play he's asked to do or how many minutes he gets.
McGee is good but he is not as dominant as howard in the inside position, when Howard was still playing with the Magic, I think that was the highlights of his career, this guy can fly and eager to play physical inside, but many the injuries he suffered has made him lost his confidence, but if he will be playing with Lebron, the best player in the earth, I think he will be more motivated. He may be more dominant over McGee in terms of rebounding, but that doesn't mean he can contribute more in other aspects of the game.
Kid just needs to get more experience and bloom there. He is just 30 and he could do more with his speed. Let us see if he will be back in NBA. 
