I'm clueless? That's funny.
Now let's do some calculations based on what you said.
5'6, 215 at 10-percent bodyfat = 30 fat free mass index
5'11, 230 at 10-percent bodfat = 28 fat free mass index
For the majority of the population, a fat free mass index exceeding 25 is incredible, we're talking absolute genetic freaks or we're talking about people taking gear.
So either the guys you're mentioning got a hold of some orals and didn't tell anyone about it, took shyt in the past, or either you or them are grossly miscalculating their statistics.
There are freaks out there. I'm assuming they're black, if they're black, they're going to hold less subcutaneous fat than most people in general, so going based on eye-ball measurements is not accurate.
I'm going to assume you're grossly underestimating their actual bodyfat percentage. They were probably 15-25 percent body fat.