Internet troll changes his ways and loses 400 lbs

That's absolutely amazing. But I once read that once you become fat it's easier to gain fat because your "fat cells" are still there, just deflated.
Is this true?

Why has his body has changed colour?

Was this that dude that was trying to troll the bodybuilding.com forums? Because I remember being on that thread. It was quite inspiring to see that there are people and communities on the Internet that actually care, unlike 4chan.

Is this the guy getting a "Lap dance" from a girl but in reality she was grinding his belly, on Tosh.O?