Honestly?
Seattle and Denver. Or a team with a good QB already.
Seattle has a great defense that is on the field far too much, ditto with Denver.
Both have good runningbacks, denver has a good offensive line, Seattle has great WRs+TEs just no one to throw them the ball.
Both are in divisions they have a chance of winning even without Manning, they are both just held down by bad QB play.
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Whatever...