Woods is a very different runner than Patton.
Patton's shiftier, has a stronger lower body(like Hatter pointed out.) He has a lower center of gravity (almost like Darren) and can use that strength to stay up and break tackles.
Justin's faster. He's a type of runner that hits a hole at full speed, and if someone doesn't bring him down there, he's off to the races. I wouldn't count on him getting a whole lot bigger like a lot of kids do when they get in the college weightroom, because his dad already has him working out more than anyone I've ever seen already, and he has two older brothers who are/have played scholarship level football elsewhere(junior college and division II I think, but not for sure.) Not to mention too much extra weight would lag down what I think is his greatest asset, raw speed.
Apparently his youngest brother is supposed to be the freak athlete of the family, which coming from a family that already produces amazing athletes, is pretty stunning.
Not even Justin is sure he's going to stay at RB. That's where he wants to start, but he may get moved to wideout or corner. I'd guess corner is more likely due to his receiving skills not being the greatest, and his speed/body type would make for a damn good cornerback.
Like most D-1 football players, his dream is to play in the league. He'd rather play at RB, but he'll play whatever position he needs to get there. I personally think his best shot is at corner.