It's very believable I have a guy who comes to my store named rick, dude weighs about 215 5%bf (NOT KIDDING) year round, works his ass off though. HUGE ARMS very very thick his genetics are CRAZY on prohormones he gets up to 220 and looks INSANE huge huge veins and shit, on just a little juice he would be a competitive pro. Probably would be competitive around 225 as a pro and I'm not kidding. For as blessed as he is he can't be the only one, and surely there has to be guys even more blessed.
na not in this earth maybe hes from another galaxy though who knows,,
this is where natural freak ends ill even write it for you:
white guys ,,mostly eastern europe check republic,,russia german,,230lb 10% at 6'1 with good muscle shape
black guys 250lb 6'1 13-15%
those 2 gguys will be the natural freaks among a group of 1000 bodybuilders that are truly natural
there arms will mesure 19.5-20.5 inches and they most likley been experiemnted with the drug called dianabol here and there but nothing to take them off natural status in the eye of the average bodybuilder
anything you describe above is imagination at best,,you dont walk around 5% unless you are on hormones and related drugs especially not at anything over 200lb unless you are 6'6 but even then you are a user