Dude is strong as shit, and also athletic, and has a better build than 99% of the people here.
I think crossfit is dangerous and dumb, but that's not the point.
Your first sentence summed up my position. I'm not sure how dangerous CrossFit is, and if it is dangerous I would say that also makes it dumb, but I imagine you have looked into it and little more than I have, in order to hold that position.
I wanted to say that Rich Froning probably has size comparable to Frank Zane - but Frank was 185 to 205 in contest condition. That may have put him closer to 215 in the same condition as Rich, with both being the same height - 5'9.
So Frank probably has 10-lb or more in pure muscle on Rich, but Rich still has a great physique, and clearly a functional physique at that.