Serious question? I think ETSU could beat Alabama if they had a one man advantage on every play. It's not that hard to spread 5 WRs and pass to the one that doesn't have a guy on him until you're in the end zone each time.
The reason we see these shifts in power is because the game is so competitive and the smallest difference counts. Auburn went from 3 wins to a national title in 1 year recently. We went from 9-4, 9-4, to 4-8 without a whole lot of personnel changes. The difference in an entire person missing on the field is something no one could overcome, even Alabama.