Purely hypothetical - Had australia grown up with one code I think the top two divisions would have looked like this. I have put composite/merged teams in bold and possible contendors for 'top team' in italics, had the compsite teams never come about
Premier division
QLD - Brisbane Broncos, Brisbane Lions
WA - West coast eagles, Fremantle (Subiaco, West Perth)
SA - Adelaide, Port Adelaide (Norwood)
NSW metro - Canterbury, Penrith, St George Sydney Roosters Sydney Swans
NSW country - Newcastle Knights
Vic Metro - Collingwood Essendon Richmond Carlton Hawthorn Melbourne Storm (Melbourne)
Vic Country - Geelong
ACT Canberra Raiders
NZ - Aukland
2nd division
QLD country - Nth Qld raiders
WA - East Perth Perth Glory Claremont
NSW metro - Wests Tigers Cronulla Parramatta Manly Souths
NSW country - Illawarra
SA - Sturt Glenelg
Vic Metro - St Kilda Kangaroos South Melbourne Bulldogs Fitzroy Port Melbourne
PNG Port Moresby
NZ - Wellington
Premier division
QLD - Brisbane Broncos, Brisbane Lions
WA - West coast eagles, Fremantle (Subiaco, West Perth)
SA - Adelaide, Port Adelaide (Norwood)
NSW metro - Canterbury, Penrith, St George Sydney Roosters Sydney Swans
NSW country - Newcastle Knights
Vic Metro - Collingwood Essendon Richmond Carlton Hawthorn Melbourne Storm (Melbourne)
Vic Country - Geelong
ACT Canberra Raiders
NZ - Aukland
2nd division
QLD country - Nth Qld raiders
WA - East Perth Perth Glory Claremont
NSW metro - Wests Tigers Cronulla Parramatta Manly Souths
NSW country - Illawarra
SA - Sturt Glenelg
Vic Metro - St Kilda Kangaroos South Melbourne Bulldogs Fitzroy Port Melbourne
PNG Port Moresby
NZ - Wellington