I understand the suspension has nothing to do with grades.
What if he comes back and plays against Wichita State or any of the games after Dec 15 and decides not to enroll in school for the spring semester? He would have played in several games without ever been in school for either semester. Nothing is binding for him to come back to OU.
This isn't like a transfer who is in school for the first semester and becomes eligible immediately after finals. That guy was enrolled in school and is a student. Doolittle isn't a student. If he had been suspended from the team but still a student like Joe Mixon was, it would be different, too. It's just my opininion that he will have to attend a day of class making him a student again before he can play or practice, and the first day of class is Jan 16th. I hope I'm wrong but I just don't see how a non-student can play in games.
Freshmen football and basketball players can't participate in team activities until they attend the first day of summer school classes.
Note: I contradict myself because I don't think Polla ever attended class before arriving just before their international tour. I just don't know about Doolittle and when he can play again.