...as someone who got kicked off his collegiate team for a drinking incident i'll throw in my 2 cents.
1) I'll bet it was more that it became public then anything else.....
2) Vin probably heard some of the drinking stories thru the grapevine and felt he needed to send a little message...not a big one, just a little one to get people's attention (maybe AJ's been screwing the pooch while he's been injured)
3) the US drinking age of 21 is ridiculous...who do they think they are kidding....having an 19-20 yr old at college who cannot drink with one who can is a recipe for disatser (egs immature drinkers who got to get in as much as they can when they can)
4) and I'll bet money the coaches conversations involve some what were they thinking attitude along with what a bunch of idiots......and a whole lot of chuckling behind the scenes about how a bunch of guys are shaking in their boots and feeling one inch tall now that they've been busted