I have a feeling that we see a lot more of Rawls against Illinois. I'll bet the Purdue game was an, "enough is enough" moment for Hoke & Co. concerning Fitz. I am by no means an OC, but I saw several plays where Fitz had at least 4 yards if he would have just taken on the tackler and fallen forward. Instead, he danced and got little to nothing. Hoke has mentioned in several pressers that Fitz needs to "put his foot in the ground and go upfield" better. It looks as thought Fitz has regressed back to his early 2011 form -- he's not seeing the holes, and he's running east-west.
Although I agree with the "extra blocker" issue when Denard runs, it seems odd that the OL can block well -- even with a stacked front -- for Denard, and Fitz is getting absolutely nothing.
As I said, I think we see more of Rawls versus Illinois, and if he does well, against MSU. He takes on the tacklers, breaks tackles, and at the very least falls forward.