The reason I think that you are not 6.4% is just simply becasue that would give you a height adjusted LBM of about 7-8 more pounds than Ross (given your 205 - 209 weight). As I said, Ross was a maxed out natural. What does that mean? It means that he gained all of the muscle that is theoretically possible for someone of his size and bf%. You are basically his size, yet you are claiming significantly higher LBM numbers. It just simply isn't possible (without steroids). Let me simply ask you, do you look anything like the picture of Ross? You should look MUCH better than he does given that you're carrying significantly more muscle and less bodyfat. I have to say that for all of the people that make outragous claims (usually on bodybuilding sites), when they post pictures, for some reason they don't quite look like what they claim. Yes, I know that modern bodybuilders compete at much lower bodyfat. Ross competed in an age when 8% was pretty much the standard. I'm not just guessing at his bf%. I pulled it from the book I linked to. And looking at his picture you certainly wouldn't mistake him for someone with 2-4%. He looks nothing like those veiny creatures of modern bodybuilding. But as you say, it really doesn't matter. If you want to be 5' 10.75" and 209 with 6.4% bf I think that is just fine. It just simply means that you have somehow exceeded what any natural bodybuilder has achieved (and by a significant amount).