I watched the video, and I'm not all that impressed by this kid. It looked to me like the vast majority of all those big runs were on draw plays, and since Hawaii passed so much, the defense is almost always expecting pass. The draw play is one of the best ways to pull off some big plays when you've got the defense lulled into pass defense mode. The WRs were running way upfield, and there were enormous holes and open space for him to run through because the defense was so spread out.  
  
Now to your point, he looks like he has decent feet for a guy that size, (if he really is 225), but I'd say those big numbers were more a product of the offense he was in and not him pulling off amazing runs. When it comes to running backs that late in the draft, who really knows anyway though right? Haha...I could be wrong about this kid, but he doesn't seem that special to me.