These things are cyclical. Tennessee has stunk for awhile, but they can be good again. TN isn't a talent hotbed, but they're adjacent to plenty of talent. They haven't had THE right guy at HC, but eventually they will. I'm confident of all this because I investigated a hunch and it yielded something:
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Tennessee is good when Alabama stinks. Tennessee stinks when Alabama is good.
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I plotted both programs' wins each year, starting at 1992 (Alabama's 13-0 NC season). I had this hunch because of what I've seen and remember, and by 1992 I was pretty much a college football fiend.
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There are points of intersection (seasons): both were 9-game winners in 1993, 10-game winners in 1996, and within a game of each other in 1999. BUT....
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When Alabama dropped by 4 wins from 94-95, Tennessee improved by 3. While Alabama struggled to 4 and 6 wins in '97-98, the Vols jumped to 11 and 13 wins (and a NC). Tennessee regresses by 4 games in 99...you guessed it, Bama improves to 10 wins. Bama goes back in the tank in '03-04, the Vols enjoy consecutive 10-win seasons.
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And since Alabama's resurgence under Saban...oh boy! Since 2008, Bama's worse has been one 10-win season (that's in the past 12 years!). Tennessee? Their BEST was a pair of 9-win seasons, but mostly sat between 4-6 wins.
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The Vols will matter once again, but probably not until Saban hangs it up. You can look up what I said here, the line graph is quite remarkable.