Dorian at that age looks like an average skinny kid. I think there is more variables than that.
having good genetics does not mean you are born looking like a gorilla, it means your body has the ability to use the food and drugs and a more efficient manner, it means when you gain muscle size the shape and muscle tie ins are optimal. look at kevin leverone when he is off.
genetics is also not a free pass. the gifted do have to put the work in. but the first part is having that magic wild card.
if you don't have the true magic like some pros that do not step on the Olympia stage you have to work a lot harder, guys like shebly and b-boy come to mind, they do have better genetics for this, though certainly not the best, then they train and think hard about how to make the whole thing work, after years it does.
very few people really train right. there is no single right but, im talking with intensity and direction day in day out doing it all correct like pit is talking about.
for me the gym is my time, its my time not to look in the mirror and be pretty, it is my time to close my eyes and get rid of the demons inside, I train, I beat the living shit out of myself, but im fucked up, im not normal, there was some vid with Even whats his name going on about this I think, normal people do not have the drive or intensity to beat the hell out of themselves day in day out, make yourself puke for fun or do legs until you cant walk. it has taken me years of training to figure out how to train and not hurt myself, which is still a work in progress.
I have seen a few pros train, in most cases I was not terribley impressed, but then again when I played football 17 people on my team benched over 400lbs, I think 10 squatted 500 one squatted 600. I have also trained with some real meat heads that were all over 300lbs usually around 350, just giant mosters that people run and hide from... lol
but the guys that really have the pro shape/size/genetics are just on a whole different level. even the giant meat heads while impressive just do not compare.
actually there was one guy that joined my team late in college, he was featured in flex magazine, back then to me he wa ssmall, supper jacked but trained with very light weight compaired to the strong guys on the team just had that real good shape. he looked great but was small when you are around guys who are 300+ or 250 and lean, or the one guy who was 6'8" pealed out at 350+ looking like freakin harry from harry and the hendersons....
these are not internet exajurations either. im sure if I went into detail some here would know some of the people im talking about.