The only rule they have to abide by if Eric wants to pay for their tuition is to not take an official visit to UT. It's halfway through the season and they have yet to take an official visit, and they haven't planned one for the future. South Carolina is the last big home game (I guess you could consider Auburn a big game) and they aren't official visitors this weekend. Do you think they are saving their official visit for the Vandy game? I know I wouldn't.
Or they could just be waiting to take their official visits after football season, they know what the gameday atmosphere is like at UT so they might prefer an ov in the offseason that allows them to spend more time with the coaches who aren't preoccupied with a game