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For the glory of winning.
In Rugby Union, the main reason why New Zealand has conquered and continually defeated every other team this year is due to money and being genetically superior and equipped to the game.
In the GPS, the main reason why Newington and Scots have conquered each other and every other school is due to the money put into there teams and the 15 players being genetically superior and equipped to the game.
One of the strongest GPS competitions so far. With nearly over half of the Australian Schoolboy team coming from one institution made up of 8 schools.
Just imagine if the likes of Tepai and Tanne or Cannell still staying at there original high schools, would they be playing in the Aus. Schoolboys now?
It should be recognised that it is these groups of schools are the ones that define and keep the sport of UNION strong in Australia. Let Victoria have AFL. Let the public schools have league. And let the pansies have football.
I've deleted some of your post to save space.
There is actually no glory in winning if you are in a mismatched game. A few world cups ago the full-time professional Wallabies defeated amateur Namibia by 100 and something to nil. There's no glory attached to a victory like that (there is of course the honour of representing your country).
New Zealand are the best because rugby is the dominant sport in that country by far, so almost every althletic male plays rugby. New Zealand is not as wealthy a country as many of the other major rugby nations - England, France and Australia are far more affluent.
Newington and Scots have won, not because of money, but because of recruiting. Even you identify that Shore decided to spend money on a grandstand/pavillion rather than on scholarshipped athletes.
The AAPGS is made up of 9 schools, 3 of which aren't strong enough to compete in 1st or 2nd XV rugby and a 4th couldn't win a 1st XV match in 2013. How can it be a strong competition when almost half the schools are uncompetitive?
The makeup of recent schoolboy representative sides should be a matter of concern for any true rugby follower. Until about 10 years ago schoolboy rep sides were about 50/50 in terms of state and private school students. Public schools haven't chosen not to play rugby, some have had their best players poached by private schools. How can a few GPS and CAS schools possibly produce enough players to compete with league, aussie rules and soccer which are played in state and catholic systems? Or indeed with countries like NZ where all school systems contribute to the ABs?
Rugby in Australia is going backwards in comparison to those 3 codes and backwards in comparison to rugby in other countries. This backwards spiral has co-incided with the increased scholarship activity in the Sydney and Brisbane GPS schools. On this evidence how is further increasing the concentration of players in a few schools going to help rugby? It makes no sense that it would and the evidence would suggest that it's having the opposite effect.
I'd be relatively certain that the boys that you mention would still have achieved rep honours at their former schools.