I'm not sure their paper establishes it, but I'll given them the point that hard work _alone_ is not enough to reach the highest levels. However, the paper seem

I'm not sure their paper establishes it, but I'll given them the point that hard work _alone_ is not enough to reach the highest levels. However, the paper seems to jump directly from that point to the conclusion that "talent is the _decisive_ element", which of course does not logically follow. I will give them that talent is one element, but they didn't need to write a paper to convince me of that. And as far as disentangling the relative importance of talent as compared to hard work, I would say the paper does nothing at all.