Not sure if anybody has touched on this, but if not here you go.
The biggest problem we face right now is trying to find a guy who can do as well as Burkhead did in the pass pro. With young running backs, it's never so much trying to make them better runners, but more of getting them to understand the pass protections better. That is going to be the toughest thing to replace.
As far as rushing goes, Burkhead has been solid but not all world. He is averaging 5.1 ypc, yes, but he only has 118 rushing yards and hasn't seen a lot of rushing opportunities so far. We have four backs right now who are going to push real hard to be that number 2 guy. I'm confident one of them is going to step up and play the same role that Burkhead did in the rushing game.
So like I said, the biggest hit we take is a guy who was phenomenal in pass pro for his age, but finding a guy to get some rushing yards will most likely not be a big worry.
If all else fails, have Helu spend more time in pass pro since he has done a great job, and then have another guy carry the ball more.