I watched the whole game and it is worth noting that his overall defense in the 1st half (I think he played 16 mins) was not convincing. He does body up with both hands in the air and he boxes out regularly. However, his reads were slow, and therefore he lacked a step. He is not an elite type of athlete to recover quickly, he is a big afterall. His effort wasn't the issuse. I believe reading the defense is something that improves with reps as long as defensive fundamentals are sound. He is not a true shot blocker, more of a shot challenger. For a 20 year old he just needs 3 more high level seasons to become a very usefull player. He will produce points regardless, on rolls and putbacks. It is just that the defense will determine his minutes and career.