First you have to define a junior, that's a whole shitfight in itself, particularly around the Sydney clubs.
Going by the current interpretation, someone that makes a first grade debut at a club where they have played all their lower grade games.
And I would also put a time limit of such on it, say from 1998
Fair point.
Australia/NZ or Origin reps would be a more accurate measure imo.
No, because that favours whichever side has the less junior numbers. I remember a thread from about a year ago where someone listed stats on where each NRL player came from, and the NSW junior system was seen to have made more first grade players over Queensland by a significant margin. NSW has more junior players, but they also have more opportunities for young players without having to move. If you are a young player in Brisbane that the Broncos dont pick up means you have to move to get a gig.
Checking Wikipedia, who list from 2004......
2004 POTY - Bedurus (Newcastle), Rookie cutie (Brisbane)
2005 POTY - Thurston (Canterbury/
Toowoomba), Rookie, Tim Smith (Parramatta, Gold Coast)
2006 POTY - Smith (Melbourne/Brisbane Norths), Rookie, Hayne (Parramatta)
2007 POTY - Thurston, Rookie Folau (Melbourne/Brisbane Norths/
Parramatta)
2008 POTY - Orford (North Sydney/Central Coast), Rookie, Sandow (Souths/Gold Coast/
Logan)
2009 POTY - Hayne, Rookie, Idris (Bulldogs/
Parramatta)
2010 PTOY - Carney (Canberra), Rookie, Gillett (Brisbane)
2011 POTY - Slater (Melbourne/North Queensland), Rookie, Cherry-Evans (Manly/Sunshine Coast)
I listed the junior clubs in reverse chronological order. In italics are junior areas not afilliated with an NRL club, or in the case of Folau and Idris, an NRL area that they played junior footy in at high school but moved on with famly).
With that, Brisbane and Parramatta seem to be the most fertile.
In doing this, I am amazed to find that Thurston could not get a gig with a club unless he played for free, and then only 2 clubs were interested. The first was Nathan Brown at the Dragons, but he ended up at the Dogs because it was closer to his managers place and that made his mum a little happier. How things change.