Again, you are trying to equate differentiating educational systems (public vs. private) with club lacrosse. The two do not go hand in hand. Sorry, but parents are not doing pre-1st when their kid is 5 years old to "game" the recruiting system 10 years down the road.
Most private school HS kids are about a year older than most public school kids in the same grade. This is a direct result of the education system. It is not a viable argument to say this system was developed to influence sports recruiting. Therefore, it is not fair to say people in this situation are "gaming" the system. Should parents have their kids skip a grade in private school to keep in line with the government system? Seemingly, that would be "gaming" the system.