Hmmm
I think anyone can do it, get to 6-10% bodyfat but it takes alot of hard work and sacrifice. It is hard for fat people to go through the motions and stick it out, and it isnt realistic for them to get in such good shape knowing they will never be able to stay that way.
I was a fat kid all though highschool, but I have amazing Genetics, I was 6'2 265 when I graduated, bodyfat was amazingly high, i had a huge gut, tittys and everything Life sucked. I got in good shape lifted put on a ton of mass got cut and it feels amazing. I keep trying to explain to people who much better looking good feels then any food, treat drug or anything.
Changes your whole lift if you do it right.