By the looks of things, there seems to be a lot of RB's better than him. And being that he's 5'9 175lbs, the only other option would probably be DB.
Duke Johnson, 5'10" and 180lbs, are those 5 lbs really that important?
Its not all size, sure that helps a lot,
but the point is another big chunk is will, determination and heart. Thats why so many 5 stars fail and 2 stars succeed. They may have never been the physical specimens others were in high school, but they put their head down and learned how to play better. Thats your Bradys, your Brees', your welkers, your zach thomases, and yes even your ray lewis' (he was undersized for an lb remember?)