They Aint Pretty , but They WON!

How 'bout dem Cowboys! In an exciting game where the momentum swung back and forth like a pendulum, the 'Boys prevailed! Romo looked great after what had to be a confidence shaking game against the Saints and the defense didn't give up even after giving up 4 touchdowns to the explosive Falcons offense.
My only question would be why is Marion Jones not the feature running back when his prodcutivity in the clinches is way better than Julius Jones? As a one-two combo, they are impressive, but Marion seems to only get in on short yardage situations or later in the game.