They better find a running back because neither Allen or Nixon are good enough at this level. They both are too slow and neither is physical enough to run through people.
They both are 3rd down backs and no more.
Allen's lack of speed didn't hurt last year because we had Shrader, who was more dangerous then Allen, and teams had to spy on him. Then they ran the wildcat with him and Villari, which worked for a couple games.
If they can't get Willis and James up to being able to contribute this year, teams will blitz a lot this year.