Joeys barely got that back in the day when they were dominant....
Sorry to burst your bubble on this, but in 2005 Joeys had 11 NSW School reps in the two NSW squads and none in the shadow squad. So they have actually bettered Newington's 2013 result. It's on the AAGPS website, have copied and pasted below.
In 2006 still very good, 9 NSW School reps in the two squads.
I only went and looked at these two years as David Kirk represented them in his article as some type of golden era to look back on.
GPS REPRESENTATIVES IN NSWSRU
NSW 1STS
DANIEL ROACH (SIC)
SAM EGAN (SIC)
ROBERT McMICKAN (TSC)
PHIL MATHERS (TKS)
MATTHEW DAY (SJC)
ALISTAIR CLIFTON (SIC)
T NORVAL (BC)
PATRICK McCUTCHEON (SJC)
NATHAN SIEVERT (SJC)
KURTLEY BEALE (SJC)
WILLIAM GRESHAM (SJC)
MITCHELL INMAN (SIC)
A BARRETT (ILLAWARRA)
LACHLAN ROSENGREEN (SGS)
LACHALN TURNER (NC)
R O’CONNOR (NORMANHURST)
DANIEL O’CONNOR (TSC)
TOM DUNWORTH (SJC)
J PALOU (BALGOWLAH)
B McCALLUM (KWS)
MATTHEW SCHWAGER (SJC)
R KELLAM (CUMBERLAND)
CODEY MEDWAY (SJC)
NSW 2NDS
D PALMER (WARILLA)
S DREWE(CHEVALLIER)
K WARD (PTMACQUARIE)
M WOOLVEN (PITWATTER HS)
J BARRY (BC)
DAVID ARMSTRONG (SJC)
JAMES McMAHON (SJC)
HADAMS(BC)
S BRADLEY (BARRENJOEY)
M DE LORE (WHITEBRIDGE)
JUSTIN BOSILKOSVKI (NC)
R O’REILLY (TGS)
PETER BETHAM (SJC)
CHRIS YARRINGTON (SHORE)
P MCCABE (SAC)
C CROUCHER (HVGS)
A SAVOSKI (FRANCIS XAVIER)
D SMITH (BARRENJOEY)
W VALAWALU(KWS)
M PORPIGLIA (PRAIREWOOD)
D ROBINSON (SSC)
A MCKENZIE (FARRAH)
A MAFI (WESTFIELDS)
SHADOW TEAM
TOM BOWDEN (TSC)
TOM GORMAN (SIC)