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They has largest fleet among all active Yonkos
Also, keep in mind the WG has information the public doesn't.
The WG KNOWS Luffy defeated Crocodile, Moria, Doflamingo, etc. They're aware that many key figures of royalty and authority owe debts to the Straw Hats.
To the public, the Straw Hats only have Fishman Island as their territory. To the WG, Alabasta and Dressrosa may also be considered SH territory. And, what about Wano?
To me, the WG wasn't scared of the Samurai. They are scared of Pluton. If the WG knows Pluton is in Wano, and believe that Luffy has direct/indirect control over Wano as a country, this completely explains him being considered a Yonkou (on top of lava-shotting Kaido). Maybe I should make a thread about this during the break...