I've not noticed a drop-off in athleticism, which doesn't mean it hasn't happened. I have noticed that he has been maybe slightly frustrated with the rotation with all the depth. He's averaging 17 mpg, down from 26, last year. The Mercer game can be attributed to foul trouble (4 PFs), but he only played 20 minutes against NKU, and had 0 PFs.
In the Mercer game, he was visibly upset with Troy Henderson, I believe, on a missed defensive assignment that led to Okpara picking up his second foul about 30 seconds after his first, and a long 10-minute stint on the bench for the rest of the 1st half.