It means nothing. This has nothing to do with the crew being physically off of Wano. Wait another chapter before you claim you are right lol.
The Yonko arc was announced 4 chapters before Zou ended. Yes, Zou is retroactively included in it, but WCI didn't start for another month, where they were officially calling it the Yonko arc.
There is nothing indicating that the final arc cannot "begin" even while the crew is still in Wano
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Btw how many arcs does a saga contain? 3?
Indeterminate.
- East Blue is 5 smaller arcs (~100 chapters)
- Alabasta is also 5 smaller arcs (~120 chapters)
- Skypiea is 2 (~80 or so chapters)
- CP9 is 3 (LRLL is included, about 140)
- Thriller Bark is alone
- Paramount War is 4 (Sabaody to Marineford, about 100)
- Fishman Island is standalone
- Dressrosa is 2 (includes PH, 150 chapters)
- Yonko is 3 (Zou, WCI and Wano 250 chapters)
It could be 2 arcs. It could be 4 arcs. It could be 6 arcs. Doesn't matter. I will say it'll probably be the longest though and overtake the Yonko saga/arc length.