Florida was my pick for most under ranked team, and I think I nailed that one. I had Miami for the reverse and am pretty close there as well.
I don't think Florida is by any means a great team, but they beat most of the teams they should have, and upset LSU and UM, which compensates for losses to UK and Mizzou. They lost the turnover margin 3-0 versus UGA and that had some bearing on the outcome, but they didn't move the ball very consistently either.
Give them a good QB and they would be a tough out.