I have been done wrong by bitches but I sure in the hell never thought about sucking a dick. I don't agree with your hypothesis.
Women are diff or are they, talk to Tyler Perry (Mr. undercover)
As far as Jamaica is concerned, the West African countries are coming up as well, and notice where they go to school and get their "training" good ol' US of A.
Personally, I think it's good for Jamaica, and maybe more runners and athletes will come out from there.
But, I also think that response to gear is a question as well. For instance, look at Flex, he was a skinny twig, and responded well to what he took, even though he was still a lightweight.
So, I think genetics is the key, but that includes ones response to training and drugs as well.
Remember, Jamaica is known for it's weed scene, and there is a big business in having it ship to the US,
why not other "drugs" for athletics being used down there.