I'll be watching his rebounding the most. Obviously he's done great to become a more active player and he's playing great defense so far... moving around the middle of the zone and blocking or adjusting shots from various parts of the floor. However, sometimes he is so active and so determined to affect every shot, that he leaves the boards open, specifically when defending the high post.
I'm not really sure how to treat that dilemma. I assume you just have to learn to pick your spots... when to go for the block and when to go for the rebound. Maybe it's less on him and more on the wings, but it's definitely something I'll be looking for.