While you are correct in your assertion that UT has under-performed over the past five years, there is a reality and that is that about 70% of all games are won by the team who recruited better. That number is significantly higher when both teams are in the top 50 of recruiting, and weaker when both teams are in the bottom 50. What that tends to show, at least to me, is how good the recruiting services are with 3,4 and 5 star players, and how muddy 0-2 star players rating can be.
I would caution using UT's record of under performance against top 50 recruiting teams as an indication that a team such as USU, who is almost as close to the bottom of recruiting as UT is to the top, has a significant chance to beat a team like UT. Sure it can happen, it is extremely unlikely.
Tennessee under-performed in relation to talent by two games last year. Those two games were against Missouri and Vanderbilt. The rest of the season (80% of the wins and losses, give or take) were directly predicted by talent. If you want to see something interesting, here is a chart that illustrates the change in talent on the two deep from last year to this year as viewed by averages of position groups.
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That is my point. There is an inherent weakness in suggesting that a teams record indicates actual ability, or similarly that last year's under-performance plays a role in the 2014 season.
The better test is what is the team's record in relation to talent. I can't speak fully on USU, and I don't feel like totally crunching the numbers, but from what I see at a quick glace of your record, I cannot find that you beat a team that broke the top 50 in recruiting. I can see that you kept it close against a woefully under-achieving USC team, but close doesn't lesson a "L" more than a blow-out puts more "W's" in the win column.
And, as I am sure that you believe that experience could trump talent, I suggest you read this:
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