Right, place your bets on how long the Oden flashback is. Going for ten chapters, a full volume, myself.
Jinbei being brought up again immediately before the Sunny gets blown up makes me suspicious of another Bad End Musical situation.
Hope we’re not going to have a week of terrible childishness about Zoro and Sanji
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Also quite obvious that it’s going to seem like hope is lost at some point then the weather will clear and Sulong will turn the tides
I say 5-7 chapters.
And Good luck handling Z vs S this week, to you n other mods.

Will be busy week for you guys.
I read people here already expect Jinbe for this arc, I think the otherway.
With this Luffy already make a good point, Big mom arriving first and still be there yet Jinbe didn't arrive has a good reason. We have far no a little point/info about the accident with Germa66 and Fishmens vs Big mom and that is a point with Oda clear want later to show up. I think their will be a point where Luffy and the others face Big mom and getting the news about Jinbe and the Germa66. Don't think that even one of the alliance could escape from Big mom.
Another point with I don't understand, why Nami,Chopper and co aren't take care about the big event with Big mom. Did they think that Bm get killed or something? That will be a major point in the fire festival, if they don't have any plan for Big mom alliance, they gonna get rekt hard by Kaido and Bigmom in fire festival for sure.
And I even believe more that Jinbe don't will come after this panel. The news about his "death" will make Luffy his mind and lose total the controll, I call this right now!!
Jinbei not arriving yet even if he had escape would be nothing surprising, it's make up for a good story telling if Oda make it like he won't come and then Jinbei comes at critical moment to help Luffy save the day.
Tho yes i agree it do seem impossible how all of em could have escaped with BM herself present there and being surrounded by BMPs from all sides.
I can see Vinsmokes flying by emself, but would they abondon their Ships n Kingdom, and armies? Doubt so.
But for Fishmens, there's good chance they escaped in the Sea. BM n her army can't do nothing to em there.
It also won't make any sense BM came to Wano even tho she had Hostages which can lure SHs back in WCI arc, like they were lured in with Sanji in the first place. And BM is smart enough to realise that, but here she is in Wano instead, in another Yonkou territory, which suggests she may not hold any leverage over SHs and had to capture em herself, for the humiliation they did to her last arc.
Yes tho there needs to be some genuine reason/twist if all of em were able to make their escape. Like maybe Vinsmokes snail ships can also go underwater like Fishmens.
But i think it would still be better if she still captured some of em and are captive on BM ship here in Wano, which would wrap the story in Wano itself.
Since, i really can't see BM returning again next arc as an Antagonist. If Oda had planned it this way, if she had another arc reserved for herself, he wouldn't have brought BM here to Wano.
I believe either she will be redeemed by Chopper/O tama or will be defeated and captured by Marines.
There's more, more reasons why i believe we won't get BM again in next arc.
Brook stealing the Poneglypp purpose was that they wouldn't have to come to WCi again.
Katakuri n Cracker have already been defeated, we have seen their abilities and we will of Smoothie in WCI arc.
The story is near its end and another arc with same Antagonist will take considerable amount of chapters and Oda has good opportunity of wrapping everything in Wano itself.
About last part of your post, i can see BM rallying up Luffy like that but only to see Jinbei still returning in later half of battle.
This type of twists aren't unexpected in Manga, where a character may be led to believe he/she has killed others but truth being they had escaped instead.
Same could be true for Jinbei against BM, BM may assumed n belives she had killed em all but they had escaped instead. Hence there's also chances Luffy won't trust BM words and will believe in Jinbei.