I just think he isn't the type of guy that hogs a bunch of shots. All the more reason to let him play through stretches when things aren't going well. I think Dunlap pulling him out quickly is having the opposite affect on his confidence.
Also he is being used poorly on offense. You can't ask him to stand out there and space the floor at this point. He isn't good at that. He is however our best post option, and one of the best players on the team at driving the ball to the basket. He has incredible speed for a player his size. Clear out and let him drive by his man. Let him get comfortable with some double teams and kicking to the open shooter. MKG being the open shooter is just not a good plan. Runs some pick and rolls where he is the roll guy, but don't just make him go stand on the wing or in the corner.