Genetics make you the stand out in level one and possibly level two in bodybuilding...However if you don't respond to drugs like some others, then you can have all he genetics in the world and it won't matter...
Look at Kamali...He made it to the last level(pro) and now he is not responding to drugs and his whole body is different...Responding to gear at the pro level is everything...Because if it wasn't, Milo's would have something like 72 Wins...And Bob Paris would be a 10 time Mr. Olympia