Oh god no I'm fine with him saving the bulk of the Rocks' story to a potential movie, but he simply cant postpone Kaido's personal story like that to months from now, or even a year, same goes to Yamato's. They are necessary for the arc to work
i think votes in the poll were higher because of online voting system as well. Like first there was only post card system. Hence 11k votes, but this time postcard votes were given 10 point, so 110k point from that alone, and then one vote(valued at 1 point) per day for 60 days as well.
are you comparing the volume sales? im sure once volume 99, 100 & 101 hit the shelves they'll sell like hot cakes and the sales will come back up just fine. iirc volume 98 released this year and not last year so that would affect the volume sales of 2020.