Explain how Oda will develop the contaiders for the One Piece( Imu, Shanks, Blackbeard, Akainu, Dragon, Kuzan, Garling, Shamrock, Koby, Sabo and Buggy) in only 250 chapters
Most of the plot lines will come to conclusions within a final battle and such a battle will always get 2 top tiers or 2 relevant characters off that top tier battles- checklist.
If the conflict involves more than 1 relevant character per side, you can even conclude the plot of 4 or more relevant characters in some chapters.
And fact of the matter is that non strawhat situations can be established within a handful of chapters with a cut away. Look at how he did it when Garp invaded Hachinosu or when the Revs raided MJ.
He just needs to let some Holy knights teleport here and there or insert panels, where it's indicated, that sailing there will lead to a certain conflict and he's good. He already did so with Fuji and Sengoku f.e.
Only conventional arcs need these tens of chapters of build up and worldbuilding.
Not even sailing towards the BBPs and confronting then needs to have a lot of build up, cause the ancient weapon islands were already fully established.