Act 2 should end now and BM vs Kaido isn't gonna be off-paneled imo
Because Oda spent lot of time just to reach this moment which means something Major & Important is gonna happen now
He wanted BM & Kaido to meet face to face in Onigashima without a War
So he made King separate BM from her Crew (Actually it's possible he made Wano's Entrance that high just because of BM)
Then he can't just let Angry Yonko on the loose in Wano so he gave her Amnesia and then created a Scenario where she gets captured and taken to Kaido
Thinking back about their conversation in Reverie Arc, everything is happening as spoken
BM promised to go to Wano, Kaido told her not to, he then threatened to kill her, she replied to him and then told him about the Debt and that they should Team Up Again. Then we see Garp talking about their Era and how it's a Disaster if they return together
So i think this is the major event guys, Kaido & BM are making an Alliance again
This will be Big News that the whole world will react to, resulting in the Greatest War that Kaido mentioned
This is bad then. The Marines can't come to Wano
Marco can't join
The remaining WB can't participate.
So we just have The SHs Alliance the Samurai, maybe the fleet (I doubt that they will make it there on time) against two Yonko
Current Luffy is not strong enough to take care of one of them so two is impossible.
Kid decided to go find his crew which means he certainly can't participate in the war.
CP 0 can't openly attack a Yonko. They got business with Orochi. So who's going to fight BM? Everyone will be busy enough with Kaido Army and BM children.
Oda might be playing with us. His real intention might be to drag BM to Elbaf ( she keeps chasing the SHs). So the main event of the Arc is certainly going to be Kaido down and BM trapped somewhere.
Or Oda is going to play his card where he makes Luffy fight one opponent close or as strong as the Main vilain?
Meaning Luffy try his new PU on BM before his showdown with Kaido? But the battle is not going to be like with Blueno. He will certainly get seriously injured so taking Kaido right after will be impossible ( well Chopper and Luffy super regeneration can be used here). And it's not like Kaido is going to wait for him(right?).
But if by chance he manages to pull that off I bet the world will definitely give him the title of the strongest Yonko or man in the world. (Jezz I just hyped myself to the extreme)
I'm curious to see how Oda has planned all this.