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So I have a theory about the latest One Piece chapter 810 and what Pedro might have meant when he said "the world is waiting on those two", many have said he's merely referencing the upcoming reverie; but I don't believe this to be the case.
I'll start by saying we know non sentient animals can communicate with sentient ones (chopper talking to camels, crabs, etc). We also know the minks isolated themselves from humans right around the time the void century was wrapping up.
Since the two kings of Zou are obviously not old enough to have been alive during that time period , but Zushina (Zou) was; what if when a king is appointed on Zou they go and speak with Zushina who relays the story of the void century to the new king(s).
This coincide perfectly with the Noah on Fishman Island awaiting the 'promised day', the world is waiting for the revelation of the void century to kick off the war that will engulf the entire world.
Luffy and them will find one piece, the kings of Zou will reveal their portion of the true history, war will begin and firemen will be moving to the surface world