because he has to play with not only JaVale McGee but also Andray Blatche, who are probably the two dumbest players to currently play in the NBA.
If you don’t know who they are, just search them on Youtube. Videos of their stupidity are on there. Just search “javale mcgee mistake” or “javale mcgee triple double.” And if you just type “andray blatche” on youtube, you’ll just get a bunch of videos him being oblivious. You don’t even need to specify what stupid action he’s doing when you search for him. He’s just naturally dumb.