In any team sport, a victory is a team’s victory; a loss is a team’s loss.
Sure, one player can eff it up and that player is to blame for the loss, but the Tennessee loss was a total defensive meltdown loss, and therefore, a team loss.
Had the loss been because Tua threw an interception instead of a touchdown on the last play, then easy to assign the blame on Tua.
That wasn’t the case. The defense totally effed up. Be real. Be honest. That was the cause of the loss.
Spin it however you like to suit your agenda, but most disinterested people asked to watch that game, and to make a judgment as to who to blame for the loss, will likely say it was the defensive meltdown that was responsible for the loss.