Apoo isn´t really wrong, what Kid and Killer expect from the previous alliance?
Because they beeing 4Supernovas teaming up against Shanks, it doesn´t really mean they had better chance.
Look right now at Luffy and co place, they struggel of alone against Headliners/Numbers(right now only one make his move), Zoro even mentioned how powerfull these guys are in number.
And most like in fact that the army around Queen isn´t even the whole squad, neither Queen do something.
We can all agree that the team around Luffy would get rekt if King+Queen+Jack and the Flyers would work each other to fight them, 4 Supernova would get rekt.
Kaido wouldn´t be even need and Kid really expect to take out Shanks with a small alliance?
They probably would get rekt already by Shanks crew before they could even see Shanks himself.