I have the answer. You start with some of the best structural genetics on the planet, throw in one of the best metabolisms on the planet, and toss in steroids, growth hormone, slin, and a little bit of God knows what else.....there you have it.
I second what everyone else said. Have you ever seen a true drug free competitor after cutting? And I mean TRUE drug free, NOT a guy who doesn't use a ludicrous amount of gear, thus looks smaller than most pros, so a mag will stick up his pic and say he is 'natural'. Every guy who competes drug free, that I know personally is drug free, looks absolutely depleted when cutting and DOES lose muscle.
Dexter also doesn't get too far above his competition weight, he isn't one of those guys who needs to drop from 300lbs down to 225 to compete. So, yeah, he doesn't lose as much as some guys when you look at the percentage of his actual bodyweight that he has to drop.
When you 'cut' eating more protein can preserve muscle, but unless you take gear there is NO way around losing muscle. Genetics, gear, more genertics, and more gear play a role in Dexter's methods. Not trying to sound negative and definitely not trying to flame, but you can't really find much use in the advice of a pro bodybuilder when you look at the circumstances they do things under. If somebody is going to dispute this, they are either one, doing it for argument's sake, or two, plain old naive.