Well, keep in mind, there was nobody pushing this thing to go forward from 09-13. The police didn't find enough evidence and the accuser didn't press charges. Hoke must have known about it, but he was probably told the Gibbons side of it. If memory serves, if you looked at the all the reports, there wasn't enough there to prove he did it, but enough to say there was more than a 50% chance it reached the level established in the new rules, I forget the phrasing. But the new 50% rule wasn't established until 2011, and by then, nobody was pushing for this thing to go forward.
It's important that the University explains what went wrong, but I suspect that's it.