Are dildos enough evidence? If someone is looking to incriminate the jocks then they had better leave something pointing to ααα. And precisely because the consequences are severe - we're talking about being expelled from campus - and because they know they are being closely watched by the College Board, such a move from the jocks would be suicidal.
This is just a personal theory that makes sense if you take into account the other attacks on the ΔIK fraternity. Vinny could be the culprit: his instability was acted in a flashback as well as his rivalry with Tommy, and he is the one who has the least to lose. However, an inside man is required to coordinate the actions. But as long as no motive is given, this theory has no more value than any other.
