@Johnny:
I remember Hawkins asking Luffy if he knew who "ruled Wano from the shadows", so I guess it is supposed to be a mystery about Kaido?
I dont know, Orochi spitting out loud to the Cypher Pool that Kaido backs him up and Teach mentioning where the beast Kaido resides, aaaand Law explaining how Yonkous hold their territories…
Easiest mystery in history to solve you got right there.