he has now made himself easy to defend. He is heading to the bucket and most often he'll go right. The folks guarding him can just wait for the tilt-a-whirl to stop and block the shot. He was impossible to defend when he pulled up and drilled the 15 footer on people, a la Dale Ellis.
Tyler hasn't shown improvement, but he's no worse. Teams just prepare for him now. He's the one they circle and gameplan to stop. He has trouble adjusting to that. If he goes pro, it'd be as a glorified garbage man.
As for Chism's size, he's a big dude. I've met a lot of NBA players, and they lie about their height by up to 2". Shaq is no 7', for sure. Chism's shown good D against Vandy's C, who is also a pro prospect.