@Big:
Don't forget the situation with Jinbe joining. Isn't it likely that he might get a little flashback for himself? (I vaguely remember that you once posted something about this…)
It could happen now but it doesn't really feel like the time or place for it thematically. Given all Jimbei's obvious ties to samurais (his clothes and current hair) and Oda's hint that Wano will include something about Ace, I kind of expect the flashback to be in Wano now. A little delayed, but where it's important.
@uniaka:
What makes you remove the option of luffy and WCI team going to reverie. Even more when new Royal sanji and his family are invited there.
Because that would be going backwards on the grandline, rather than forward. And so far there's nothing to specifically tie them to the event, compared to Wano which has been built up and foreshadowed as their next stop for ages. Which isn't to say they can't have a sub adventure, Fishman Island was supposed to be the next thing after Water 7 and we know how that turned out. Oda's totally happy to throw in surprises we didn't see coming…. but the strawhat crew travelling backwards into a political event where all the toughest security in the world and admirals are? Doesn't feel like a proper outcome.
And Sanji ain't going to be royal when this is done. Half the point of this arc was for him to disown Judge and declare Zeff his true father. I've no doubt his family can be redeemed and made into better people because Oda, but they're not going to be his family.
@The:
8-15 chapters for the rest of the arc right now are a very low number.
That's why I said at least. And that's kind of on the short end, but I also don't see it being much longer than that unless the resolution turns into a full blown 10 chapter Water 7 world builder on us.