Wow. Can't say I didn't appreciate the effort of such a theory, but it's as far as it can be by my opinion on this arc. And I am generally not a fan of the "Oda will totally subvert expectations" as just like he's always been able to surprise readers, he also often stick to some inner tropes (for example, I'd really be surprised if we'll get one arc one without the timebomb escamotage).
I'll try to fanfic the rest of Wano Saga too. We're clearly in the one-but-last part of the battle, the one where the highest ranks of the enemy group are going to fall leaving Luffy and Kaido to fight alone. In this part we're going to see all villains be defeated and the eventual Nine Shadows formation happens in front of Kaido, just to get disrupted by the urge to stop Onigashima by falling. The scene will switch to Wano with Luffy following Kaido which will go for Wano's secret/Red PG.
Here's the another of Oda's tropes: "let's obstacle the allies by joining Luffy's solo fight". I actually thought of this back when Apoo referred to Numbers usually creating havoc on cities. I think the sober Numbers will be spread along the whole Wano and the few allies which are still able to fight will go to stop them. Orochi will makes his move against Kaido, just to be stopped and finally defeated by Denjiro/Hiyori. Luffy vs Kaido happens. Kaido is eventually going to achieve his own honorable death (can't really see it happens by Luffy's hands, but I can effortly see this being the exception in the whole manga). The final fight will unveil some plot-relevant shit, like Red PG, Wano's secret, Kaido's FB, something about Rocks and who know what else which will lead to the post arc.
At some point we'll have Kid and Law having a hard time against BM but also BM having a hard time against them. If she'll eventually be rescued by her crew or defeated (can't really see the latter happens btw) depends on what Oda has in mind for her future and I can't really figure that far.
About the post-arc I have more wild fanfictionary theories which I'll share here for sake of. Trope: the usual "post-arc a new force join the stage". I can see Marines waiting near Wano for Drake's green light and with Kaido's fall they will actually use Beasts Pirates' rear entrance to show up. Among them we could finally see the Scientific Division, with Sentomaru (which used Ryuo back then, so being from Wano would be totally not a surprise) and Vegapunk going to deal with the whole mess he actually did and set for the arc (Numbers, SMILEs, Momonosuke, Queen and who know what else again). This could be the chance to have Vegapunk on the stage without having a whole arc dedicated to him (as Wano is already like totally tied to him). We'll get infos about Kuma, Bonney, Sabo, Warlords and several set-up for next one (or few) arcs. Yamato joins the crew. Totally totally totally fan-point: when they'll get to party for the new nakama, Carrot will show up having sneaked in just like back to Zou and will be part (officially or unofficially) of the next adventures.