I agree this is an unconventional arc, but we should still expect Kaido to be the defeated last. Hell, Oda chose to delay Kaido's hybrid form so he could show the hybrid forms of the other Beast Pirates first. While Wano is unconventional, the formula of the arc antagonist falling after all their subordinates doesn't seem to have been broken.
Yes, this is the obvious assumption. Kaido
should be defeated last and that
should be our go to hypothesis.
However, if we choose to speculate, there is still sufficient information and incoming information that may prove otherwise.
It is a fifty-fifty IMO.
How can Zoro come out of Wano a mid top tier and go on to fight Shiryuu who hasn't even proved himself to be a low top tier? Burgess' opponent may well be Jimbe anyway (both are helmsmen and brawlers).
Most people are under the assumption, especially given the portrayal, that Shiryu will be as strong as Blackbeard.
If you believe Zoro and Luffy are tied or near each other, Blackbeard and Shiryu will follow suit.
Shiryu/Zoro saved from prison by Blackbeard/Luffy.
Shiryu/Zoro have cursed blood-lusted blades.
Magellan washed the entire BB pirates and it was said Shiryu is equally as strong as Magellan, so Pre-timeskip it isn't farfetched to say Shiryu could have done the same. On top of this, Shiryu has acquired a new power up just as Blackbeard has acquired a power up. Everything points to them being on an even keel, with the obvious edge to BB.
Basically, there is actual credence to say that Shiryu ~ Blackbeard.
If Sanji vs King goes through then having him fight the other
bum-fucks on Blackbeards crew is a step down.
Not to mention that Sanji vs Queen has extensive support/evidence to back it. Especially with the recent chapter.
IMO Zoro leaves YC1+ and needs to beat Shiryu who is Admiral+
And Sanji leaves YC2+ and needs to beat Burgess/X? who is YC1-YC2