Somebody somewhere has to be of equal threat and power as the pirate king to cause theses three to wash each other hands. Dragon gave the WG Kuma, Shanks is allowed to stop wars and visit Mariejoa unabated. They're working together but I don't think it's just to keep balance. Even though shanks probably knows about Im, he seems more worried about Blackbeard than he does anything the World government is trying to do. The gorosei seem much more worried about the void century and the truth that lies within it than two Yonkou's teaming up. Obviously we have ancient weapons capable of one-shoting islands but this seems like something even more devastating than that. Let's be honest is Crocodile had a ship capable of destroying continents all it would take to stop him is Kizaru to solo everyone aboard. No this threat seems like the resurrection of an unstoppable ancient being. One clue we have is the Giant hat Im was standing before. I found it very suspicious that it was kept in a cooler. If we remember Oars was kept in a cold place which is why alot of his body had not decomposed. Oars jr being linked to wano as a creature who''s ancestors have been their for centuries and may have tantamount in in the creation of Wano. Literal continent pullers. Now the strawhat we saw was barely enough to cover a relevant amount of head of even oars jr let alone any ancestors that could have been bigger. Regardless we were introduced to oars and the strawhat in the same manor. stoed away in the freezer. As strong as oars jr was and as strong as oars was with a df powering him it's hard to imagine that anybody of that size being enough to scare the current day WG or marines but even A giant the size of oars or even smaller could have reached an incredible amount of power eating the right DF, having amazing talents or even through Training. What if one of oars descendants was a D. of course their can be more to this theory. I would make the connection of Oars, whitebeard and Kaidou having bones sticking out of their faces. Basically though Im being revealed around the same time as Wano might have a connection with a giant frozen hat and the mega giants of Wano. PS the Hat might have DNA on it for vegapunk to clone.