All those already mentioned are worthy candidates.
1- The whole coaching staff's best performance by far.
2- I know AJ Johnson has been around awhile and had some big games, but IMO this may have been his best all around game in terms of performance and leadership, he was making plays sideline to sideline, lining people up correctly and being a vocal and emotional leader out there. In short he looked like the player and leader TN needs him to be with this young team and he impressed the hell out of me Saturday.