Brent Brewer was in his mid 20s when he enrolled at UT in 2010 and was playing football until 25/26 in 2013. I think he played minor league baseball for a few years straight out of HS, so his eligibility was fresh when he started at UT
I think you could argue that the 13s game-winning FG-drive against Bama was a Heisman moment. Granted it was only 2 passes, but if one of those miss, we aren't even in FG range.