Look at the other panel, Marco,Jozu,Inuarashi and Neko are together and seems like they are really good friends. In otherway Vista was with Oden, I can see all three helping in Wano for the samurais.
Luffy only need to defeat Weevil,because that I think the raid to fire festival will fail.
Like how Whitebeard speaking here about the Rox, punch of monsters in one crew who fight on their own and not as a team..