He was great for the first half of his rookie year. He finished with a lot more authority. Honestly don't what happened to him. Looks like he's playing on thoughts rather than instinct. It's a hard thing to get over. If you start thinking about your shot you start aiming it. If you think about avoiding getting blocked you get blocked. If you think about not turning it over you end up turning it over. It happens when you lose your confidence or come off an injury, but mentally strong players get over it.
