I've posted on this before but in years gone by the Warriors have always been happy to allow players to participate in 1st XV programs as their system was always far superior to anything domestic league could possibly offer in terms of professionalism and development. They were also never going to get in the way of juniors who have scholarships at some of these prestigious schools. The pupils were there on sport scholarships and as far as juniors go education is, and always will be, the first priority.
The advent of professional contracts for juniors now through Harold Matthew teams throws a spanner in the works of sorts. Any signed player under 17 was expected to play for school first then top side open grade league second. There will no doubt be push back from schools offering sport scholarships for players to make themselves available to 1st XV teams above all else but you would think they would be powerless to stop a kid playing professionally bar the use of closed door peer pressure tactics. The NZR would expect kids to turn out for rep duties for say the NZ Secondary Schools team, Junior All Blacks or even provincial rep teams. Rugby League while a direct competitor should be no different.
Very interesting topic with a lot of dynamics. Will be asking around when the opportunity arises...