So projecting a 10% weight gain from HS to college and another 10% throughout college, he's over 400 lbs before he's draftable.
I got one word for that kid, Nutrisystem.
If he loses 100 lbs he'd still be a nightmare and infinitely more elusive.
As for a 160 lb kid trying to tackle that, our Pee Wee league had a limit on how much a RB could weigh, that kid is precisely why, no way for a 160 pound kid to safely man up and take that on.