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Aaron Rodgers: In a season that has been marked with excellent quarterback play, Rodgers rises above the rest because he has not cost him team a game. The undefeated Packers would go from Super Bowl favorites to postseason underdogs if Rodgers were to go down.
Tom Brady: There won't be another QB playing into January with the hardware that Brady brings to the table. The question about the Patriots does not lie with the offense, but rather can the defense protect the lead that Brady will likely stake them to?
Ben Roethlisberger: Big Ben has slowly worked his way into the NFL's elite quarterbacks and along the way he has already been to three Super Bowls and won two. His style of play is conducive to staying in a shoot out or making an improbable fourth quarter comeback if the need arises.
Drew Brees: In case you didn't notice, Drew Brees is going to break Dan Marino's single season yardage record before the regular season is over. The Saints seem to be the toughest test on Green Bay's road to repeat should they meet in the playoffs, and that has everything to do with Drew Brees.