One thing to consider when comparing the Iowa game to the Kentucky / Vanderbilt games..
The Vols had the same team speed with Kentucky and Vandy, but in preparing for Iowa, the team showed us how they was ready for the bowl game, as in, they prepped and was ready for Iowa.. when a team is prepared for another team like the Vols was for Iowa, the team speed is greater, because the team plays loose and plays with confidence. This really showed with the Iowa game. The Vols flat out executed their plays.
I'm not saying the Vols was not prepared for Kentucky or Vanderbilt, I'm saying that with the experience and confidence they gained from those games with the time off until the bowl game with Iowa, they bought in and prepared. This should play dividends for all the big games in 2015 IMO.