That's true, but he was also getting reps at FB, quite a few of them if I remember correctly. That may have been because BB was a little hesitant to give him the ball for some reason, but still wanted him to have a role on the team. You can view that as negative (kept off the field as an RB due to poor blitz pickup and lots of inexperience compared to Morris/Taylor/Faulk, or was simply not as effective a runner) or a positive (BB wanted to get him on the field and BJGE proved to be a good drive blocker).
He seemed to play well with the opportunities he was given in 08 as an RB, and again as FB in 09. Works hard, plays hard.
For the record, I don't think he's as talented as Maroney, but has a more downhill attitude and is more decisive with his cuts. I also think he's mentally tougher than LoMo, having fought his way onto the team for 2 training camps in a row now.