Admittedly, not much.
However, I have heard no claim that the videos record the entirety of the participants (girl and boys) actions. Without that, and without the girl's recollections, I don't know how a rape charge can be sustained without violating "presumption of innocence."
There were witnesses. As I understand it, the guy in the front seat (whose girlfriend talked this girl into going to the party in the first place) admitted that he videotaped 2 guys raping and sodomizing her in the back seat of the car.
If what’s been said here is correct, we now know why that video went missing: the head coach told the guys to get rid of the evidence, which (if so) is also obstruction of justice.
This sounds like a mafia-type place. So dysfunctional that the guys thought they would diminish this girl by the story getting out, when in reality it only exposed their depravity - and apparently the whole place is just as depraved as the guys were. Their excuses and enabling is morally just as much to blame for all this as the boys who acted out what everybody was telling them from the get-go.