Already did the top 5, but I've got some honorable mentions.
Gene McEver - First All-American at Tennessee, and his punt return against Alabama shot Tennessee into elite southern status
Beattie Feathers - If the Heisman had been around, he probably would have won it in 1930. Also, Feathers was the first 1,000 yard rusher in the NFL.
Whole entire backfield of the '38, '39, and '40 squads - Foxx, Cafego, Dodd, and dadgum if I can't remember the other guy. Johnny Butler?
Hank Lauricella - Guy could do everything. Punting, passing, kicking, receiving, he was truly a jack of all trades
Condrege Holloway - A real trailblazer. First African-American QB to start in the SEC, and a Canadian Football Hall of Famer with Toronto. Was very similar to Warren Moon in the challenges he faced with the stereotypes back in the day.
Larry Seivers and Stanley Morgan
Jimmy Streater - There was a time when I was 11 or 12, and I was at home, sick. I had an old Tennessee Vols highlight tape, and popped it in the VCR. Streater made some of the most impressive plays I've ever seen on that highlight film.
I'd finish this list, but I'm too lazy to at this point.