“If he lives long enough to make it to college...”
The only thing I can think is if he is recruited (especially from a D1 school), a lot of that fat will be turned to muscle via their trainers. I’m not saying he won’t be big.. he will just be leaner/faster/and in better shape. IMHO.
At 6’4” he is way over weight. Usually you will end up with a line man at around 280 to maybe 300 pounds on that kind of frame. A D1 school doesn’t want to recruit a ‘project’. He’ll be lucky to be able to play football in college. Plus he won’t be a running back he’ll be on the line
Somehow I doubt a D1 school will recruit a 400-pound running back on the basis of foot speed alone. Most schools will look for backs who can occasionally make a tackler miss. This young man looks impossible to miss.