I've been going over that in another thread on the page before Kinemon says to the group the Wano we're in now is 20 years older than the one we knew.They(Minus Raizo, who got separated) didn't make it to Zou, that is why they ended up in Dressrosa where Momo got on a wrong boat and went to punk hazard so Kinemon followed.
and 20 years thing:
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Follow the dialogue from the first panel with Momo;
M: Where's my mom...
K: Old graves, so the rumors of Lady Toki's powers were true...This Wano is 20 years older than the Wano we knew.
It then cuts to present time where Kinemon goes to tell Luffy that they walked around to get their bearings and ran into a group who told them they had been waiting 20 years.
But you see that Kinemon made that declaration right after landing in the future/present while still at the graves in front of the Oden castle ruins.
As for the travel I'll have to re-read because I thought it sounded weird they all went to Zou then DR.