Why, when you don't know exactly what's going on? The key here is the gun. If it was just weed, then there's still an issue, but it's not a killer. Plus, some college kid smoking weed doesn't really bother me outside of the fact that it's illegal (a misdemeanor). I don't think all four will be gone, especially since this is the first (known) issue for all four while at UT. Tyler had an issue while at Iowa.
Otherwise, this isn't all that surprising. It's not as if we are dealing with choir boys here and it was the same when I was at UT. Hell, I sat across from Travis Henry in a class (I still don't know how he made it into a 400 level history course). Athletes and kids doing dumbass stuff is like death and taxes.