Not that I disagree that Manning is more important than Brady, but just stating Matt Cassel's name isn't proof of that. Cassel is a pretty good QB in his own right, a top 16 IMO. The Colts have crappy backups, and brought in an old man to learn a complex offensive system. I think Manning is more important, but I think Brady is the better overall QB.
Of course Brady is better
Michigan vs. Tennessee
Too bad he went to New England
