So he's a hostile witness in a place that doesn't have the rules of court.
Bold move Cotton, let's see how it works out for them.
Why would you do this?

Possible scenarios:
39 says "I made it all up"

or

39 "Yea, that's not consistent but the details of that weekend are fuzzy"
NCAA "Why?"
39 "Alcohol"
NCAA "How old were you?"
39 "18"
NCAA "39, do you have anything to add?" or "we've heard rumors of recruits receiving sexual favors, do you know anything about that?"
39 "a pretty lady came to my hotel room. said she was student, but she looked late 20s. said her major was 17ing."