Haider,
Stop argument mongering.
Deicide has a good point that genetics can be a major deciding factor in bodybuilding success... natural trainers ALL train, eat and rest the same way... among successful natural trainees you have already filtered out those who don't train hard; don't eat right; don't rest properly... with all those variables being standardized, yes, genetics are the deciding factor.
If you don't agree with the blanket statement "all down to genetics", then please ask for clarification before resorting to personal attacks.
The Luke