Hi navy Mike.
My gym pics are leaner than his first contest and I'd call myself soft, I'm not deluded.
Thing is that equation removes bone structure from consideration. I have broad shoulders and relatively wide hips; you could have someone else my height with a far smaller waist and far smaller shoulders - yet we would both have same natural limit? Besides, who cares what a theoretical limit is?
Would you boast that you're at 95% of the natural limit? Or claim someone 1% over it is juiced cos they have better genetics? It's a meaningless number and useless equation - at best it is an approximation.
5% bf natural also brings in the dilemma that naturals go very catabolic as they reach super low bodyfat as their metabolism will slow to a crawl and they will have to drop calories to a shitty low level. If people knew what a real 8% bodyfat physique looked like instead of believing the shit they hear about Flex Wheeler having 0% bf or some athlete having 1% bodyfat we could have more reasonable discussions on good physiques using numbers - otherwise pictures are king.