His jumper makes me nervous too.
A lot of it has to do with his sheer athleticism. It gives him a very raw edge that doesn't seem polished enough to carry any consistency at this stage, although to his credit, he's doing quite well.
But I have to agree. Things seem to be moving a little too fast, and Jamario should keep his game simple. He's only being asked by the coaching staff to bring energy, defense, and rebounding, and I think it's best he go the way of the Hump, and know his role for a while.