Height, weight, speed are mostly genetics and there is no point arguing about the natural advantages some have over others. That is what separates most of the elite from the average. But holding a kid back is a priviledge for the few that can afford it to gain a unfair advantage. Otherwise, why would anyone do it! My son is a non-holdback public school kid that has played for some of the best clubs in Baltimore which are comprised primarily of private school kids and I would say that approximately 40% of those kids have reclassed or prefirst. Any unfair advantage for one kid is a unfair disadvantage for another kid!