Unless Tennessee fans sold them their personal tickets, Texas is only allocated so many tickets. In most stadiums, with home fans buying season tickets, away teams are given one corner section or half of a section around one of the endzones and then several hundred in the 3rd deck. Just check out Ohio State, Michigan, Clemson and maybe UGA when they play at home. There's a definite trend and that's dictated by the NCAA because if not for allocating tickets to opposing teams fan base, opposing fans wouldn't ever get to see their team play in stadiums like the ones I just mentioned.