I think team performance matters more for QBs than RBs. Someone who rushes for dominant numbers can still have a chance if his team is mediocre, although not bad (see: McFadden, Darren) but a QB can't win if his team has more than two losses.
"I can't say that. I'd have to say having Ryan Leaf quarterback us to a 1-15 record is probably the biggest challenge."
Rodney Harrison, on whether losing Tom Brady to injury was the greatest challenge he has faced in football.