If be interested to see a Fiji, Tonga and Samoa 15 that include all their eligible players that have declared for other nations.
I bet they would all be very impressive teams.
just looking at the RWC squads, this is what I've come up with (not sure how strong some of the links are and I've probably missed some):
Tonga:
15 Lomano Lemeki - Japan fullback
14 Ataata Moeakiola - Japan wing
13
12 Paul Lasike - USA centre
11
10
9
8
7 Billy Vunipola - ENG 8
6 Amanaki Mafi - Japan backrow
5 Adam Coleman - Aust lock
4 Siaosi Mahoni - USA lock
3 Taniela Tupou - Aust prop
2 Tolu Latu - Aust hooker
1 Mako Vunipola - Eng prop
Others
Asaeli Ai Valu - Japan prop
Isileli Nakajima - Japan lock
Kapeli Pifeleti - USA prop/hooker
Ofa Tu'ungafasi - NZ prop
Sekope Kepu - Aust prop
Samoa:
15 Matt To'omua - Aust inside back
14
13 Manu Tuilagi - ENG centre
12 Bundee Aki - Ireland Centre
11 Jordan Petaia - Aust outside back
10 Christian Lealiifano - Aust inside back
9
8 Hendrik Tui - Japan backrow
7
6 Lukhan Salakaia-Loto - Aust backrow
5
4
3 Angus Ta'avao - NZ prop
2 Mike Sosene-Feagai - USA hooker
1Allan Ala'alatoa - AUST prop
Others
Joe Taufeteʻe - USA hooker / prop
Nepo Laulala - NZ prop
Thretton Palamo - USA Centre
Timothy Lafaele - Japan flyhalf/centre
Fiji:
15
14 Sevu Reece - NZ wing
13 Tevita Kuridrani - Aust centre
12 Samu Kerevi - Aust centre
11 Marika Koroibete - Aust wing
10
9
8 Isi Naisarani - Aust 8
7
6 Michael Leitch - Japan backrow
5
4
3
2
1
Others
Joe Cokanasiga - Eng wing
Virimi Vakatawa - France centre/wing
Alivereti Raka - France wing