The arc is so close to the climax, it won't last till september, there will probably be a post-dressrosa + zou arc, I reckon Dressrosa will finish before 795
That's kind of why I included ¨it was along the way.¨They had business on FI because it was the only way to reach the NW
They had business on skypeia because their log pose led them to there, so they needed to go there
And Law took them to Dressrosa
But each and every one of those islands had a reason to go there, and like I said before there are at least 3 different destinations that have more priority than Wano. Whole cake island, Zou and Kaidou metal island.
If Wano is such a strong and independent samurai island that doesn't like outsiders and isn't familiar with outside culture very much, I doubt someone like Kaidou is chilling there because that wouldn't make a lot of sense.
Also how would the sh's pick their next island ? they are stuck with the 3 way log pose and unless they can find an eternal pose for Wano how would they navigate to there.
And why would Momo and Kin'nemon take them there ? Please come to our country that doesn't like outsiders and please guy with the green hair bring the katana that you stole from one of our people's heroes grave. There are more pressing matters on hand than a roadtrip to take momo and his caretakers home.