Mass is not optimistic? We're fucked.
Ha, I know, I know.
But I am a big believer that NFL running backs that offer long term success tend to fit into a similar body size. 5'10"--6'1", 210--230 pounds. Or somewhere around there. Low to the ground, not a lot to hit, and thick. Better short than tall.
That's why the upright Adrain Peterson made me nervous, and why the high-waisted McFadden makes me wonder. My worries about Peterson seem a little unfounded right now, but at the same time, he DID get hurt this past season. More than once, IIRC. Wouldn't surprise me if Marshawn has a longer, better career, who isn't close to the same talent, but will probably take less hard shots.
Bush presents a different set of concerns for me. These monster backs, it seems like the set of circumstances they are in needs to be a certain way in order for them to succeed. When KC had Word and Okoye, the offense focused on the running game wearing down the defense, and those teams ween't built for comebacks. Maybe that was a byproduct of crappy QB play, but they always seemed one-dimensional.
And those big backs always seem to boom or bust. I'd like to figure a way to research the history of big backs, but dunno how I'd do it.
Or maybe I'm just still smarting from the Nick Bell draft pick.