Wellnow, I don't disagree with you. How about this... MOST American distance runners don't work on all the necessary running skills... just adding mileage. And as Shadrock so elegantly put it, they Kenyan's outwork us.
Note, I do think there are genetic differences, but I reiterate I think our top talents and their top talents are most likely equal. They just have higher proportions of their population who can run fast.