Weird fitness development in friend?

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/fit/, help me with a mystery.

> Have friend who wants to get in shape.
> 5'10, 220 pounds, M, works in a kitchen, definite endomorph.
> Take him to the gym with me, get membership set up.
> Can squat and deadlift in the 250-320 range. Think this won't be so bad starting.
> Can't bench past 90 pounds. Expected for beginner.
> Somehow OHP is at 75 pounds. That's a weird ratio.
> Go on a run, tell him to quit when he can't run anymore.
> Somehow keeps going for an hour.
> Next day take him swimming to see if he'd prefer it for his joints. ( He didn't complain about running but I was thinking about him being a fatass. )
> Eventually just stops because he doesn't see fatigue coming any time soon.
> Look at his diet. He eats healthy by any standard, just shitloads.
> Explain CICO, he doesn't get it at first.
> " But anon, if I work hard enough does that really matter? I'm not eating bad food. Can't I just work harder? "
> Nigger you already work 13 hours a day calm down.
> Tell him he's arguing with thermodynamics.
> Somehow he understands that immediately.
> Do observation for a week before telling him to cut.
> Nigger was eating 5-6000 calories a day.
> In actual, real fucking food.
> He's cutting now.

Essentially what I don't understand is how a complete beginner can lift so heavy in some areas, but also have that OHP/Bench ratio, and how the fuck a fatass like that can run/swim like that.

Seriously fit, what on earth conditions someone like that?