I agree it's not even close, BUT I now believe you need more than just a "servicable" RB to win the Super Bowl.
Just look at the Patriots (and I admittedly say this in hindsight). They won three SB's in four years with one of the greatest QB's in the history of the game. Since then: several near championships ('06, '07, '10 and '11) with the same HOF QB , but they weren't able to close the deal in any of those years. I now believe the difference was not having a "Mariano Rivera" RB to close out games. If they had Antowain Smith or (even better) clock killin' Corey Dillon in any of those years, IMO they win AT LEAST two more Super Bowls.
Don't get me wrong, I don't think you need an Earl Campbell when you have a Tom Brady, but I do think you need to do better than BenJarvus Green-Ellis as your FEATURE back to close out games.