And if IIRC, that was explained because of the boys' physical size relative to their cohort, and that coaches fed into the loop by granting more attention to th

And if IIRC, that was explained because of the boys' physical size relative to their cohort, and that coaches fed into the loop by granting more attention to the children who appeared to "have natural talent," (when really, their natural talent was that they were born earlier). The book isn't an explanation for the thesis of the 10,000 hours rule. It's an explanation for why outliers exist. In the case of sports, it appears to be a conjunction of physical size + willingness of coaches to round out the edges of their ability. With complex tasks, it appears to be myriad practice.