Well, I don't know if he'll reach those numbers. To me, it just seems like common sense to go with a multiple back backfield. I mean, we have Grant, Jackson, Wynn and Lumpkin who showed some good things before he got injured.
I think he will be the leading rusher with 1100 Yards with 4.5 YPC. That would come to 245 carries. Still alot, like I asume McCarthy will do anyway, but that leaves something for the other 3 backs aswell.