It's somewhere between the turtle lion guy and egg guy from big mom pirates arrive...and they explained and showed BM flag and told Luffy fishman is under BM...I'm on my phone it's a hustle to post pic in worstgen..
We know kaido is supplying weapons cause we had cp0 in wano for that reason...
Ok then, lemme count it for u
I will just follow your logic here
Yonko island count
Shanks : 1 (random island that barto took)
Bigmom : 2 (whole cake, fishmen)
Kaido : 1 (wano)
Blackbeard : 1 (hachinosu)
Luffy : 0 (i don't even remember where.. Lol)
WG : 3 (marineford, enies lobby, impel down)
If anyone has more just post it, i will update this..