... of the most underrated positions. Think, if Peyton Manning were to go down in the preseason could Jim Sorgi step in and make Indianapolis respectable? Matt Cassel was able to get the job done when Tom Brady went down in game one two years ago.

Having a good starting quarterback is very important to success in the NFL but having a steady backup that can step in when needed is undervalued. It's harder to come up with a list of the top QB duos because most of the backups haven't received playing time due to the starter being good.

For instance, Manning and Sorgi would most likely make somebody's Top 5 QB duos list because of the excellence of Manning. Ranking the best duos has everything to do with the starting QB and nothing to do with t...

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