Not everyone is Adrian Peterson. Don't get me wrong, I wish Derrick a full recovery. But I'm just saying...
AP is a freak of nature. They cut him open and just found muscles all over muscles. Toss in GH and whatever else, he came back stronger from just taking a few months to relax and let the hgh do its job.
Rose is likable, but I dont think he will be able to match the same level of quickness he had. Without that, he'll be average.