One factor that folks aren't accounting for is that Coe played on a pretty mediocre team. However, on the flip side, at least his team was schematically similar to Iowa. Thus, if the similarities are as close as he's suggested, the transition scheme-wise might be easier for him to get used to.
Another thing is that Coe is physically mature enough that it shouldn't be too overwhelming for him to step up and handle the blocking responsibilities of the job. Furthermore, consider that Coe has pretty nice ball skills, so he could prove to be a threat when it comes to catching the ball out of the backfield.
This is what I think is important, the one thing I keep hearing about this guy is that he is very good catching the ball out of the backfield. The possibility here is that he might be a bigger, stronger, and slightly faster version of Arob and if he can manage to pick up blocking schemes it could be like having a 6th lineman out there helping out. I for one am excited about this kid. Hes got potential to be very good no matter where he ends up but if he stays at RB he'll be pretty freaking good.