I disagree. I'm 205, 7%bf, at 5' 7". Not over 6' and 250lbs, but enough mass, and lean, no drugs. Most people simply don't have the consistency over time to make great gains for themselves. Genetics help, but to radically change one's physique, is attainable for everyone.
at 5'7, you're claiming that you'd be roughly 199 pounds (just doing some quick arithmetic and using chick's estimate of being 4% bf on stage) in contest conditioning. natural.
i believe, good sir, that this would place you amongst the elitest of natural bodybuilders, as i believe many of the "cheaters" in the WNBF step on stage at that size, which is particularly incredible given your height as even the 200 pounders there tend to be more along the lines of 5'10 or so.
so congratulations, you're bigger than the best natural bodybuilders, including the ones who probably aren't actually natural, and within 10 pounds of contest conditioning to boot.