I am just guessing here, as I don't know the details on either. But with Wilkins his punishment has already been given. It was the first 5 regular season games. So that does not incude exhibition games.
Correct if I am wrong, and I very well maybe be wrong here, but didn't he (POB) play in those games while the NCAA was still gathering information and they hadn't made their ruling yet on what his punishment would end up being? I think they (NCAA) are okay with the players practicing but not playing (not even an exhibition game) until they made their official ruling and / or punishment.
I honestly don't know about either. Total guess on my part.