Most people who say "its all drugs" also know its about the genetic response to drugs. When I say, "its all drugs" I am also implying that the particular person has an insane genetic response to drugs. So its drugs and genetics.
As for drive LOL! Paul Dillet and Flex Wheeler were extremely lazy in the gym, and both could be considered great bodybuilder.
If you have great genetics and access to the best drugs, you can easily become a pro with a shitty work ethic. Thats how important drugs and genetics are. Maybe you wont be ronnie coleman, but with the right genes, you will look like Flex Wheeler.