By ボスクリエーター 
Luffy, Eustass Kid, and Trafalgar Law were each granted a 3,000,000,000,000,000 Berries bounty for their roles in the recent defeats of Big Mom and Kaidou. The three captains were equal, but only Luffy possessed the Emperor title? Why is that? According to one idea, their bounty is based on the combined bounty of Big Mom and Kaido, which is approximately 9 billion Berries, and is divided among the three of them. Which makes sense to me; the next question would be why only Luffy could have the title of Yonko. Because Luffy alone defeated Kaido?
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Potentially. Then, an idea came to mind, which could also be a result of what is occurring outside of Wano. I recalled the cover art from Chapter 875. This proves that the Straw Hat Grand Fleet has been inflicting devastation throughout the Grand Line, spreading the Straw Hats’ influence, and that the Marines have been powerless to stop it.
This is also consistent with how Buggy must have been crowned Emperor, as a result of his power, and how he must have collected a fleet of illustrious ships that the Marines cannot command.
Stig Editor