The problem isn't just what "you" do but what "they" do as well. There are 4 power conference backs coming back off 1700yd (I'm counting Cook's 1691) seasons with the worst of them avg 6ypc. Frankly for a RB to win the Heisman in 2016 you're going to need CRAZY stats. Hurds yardage will likely need at least a 30% bump and be finding the endzone often. That's a lot...particularly with Kamara waiting to take some stats off the field.
Dobbs is helped a good deal by his running ability but it's still hard to imagine he wouldn't need around a 50% increase in yardage to keep up with Watson et al.
Upshot-the Heisman question is as much a matter of what the other guys are doing as what Hurd and Dobbs are accomplishing.
I wish the Heisman were banned. Rename it the media hype, regional prejudice, and good ole boy club award somehow. Such an ugly distraction from the beauty of this game. JMO.