Moss is more a north/south runner and more likely to fail with the way the line is blocking atm. Singletary is your scat bounce to the outside runner for the edge runs. Funny watching the games and they have some nice design run plays to the edge and a defensive player breaks through at the snap and disrupts the play. There was a couple edge runs last week with singletary for some nice yard and it was moss that got the third and one on pure will when he was met in the backfield he powered enough to get the hard.
Tough running no matter who the back is presently with the guard play