Now that I did something these plot points I bring up would make sense..
1. Luffy, vegapunk, Bonney going to the past (even if it's mentally). We have Kuma fruit via seraphim Kuma, and Bonney fruit that manipulate and distorts time, and luffys imagination fruit.
2. The saturn gorosei being strong and controlling all 7 seraphims. Saturn has 7 rings. It's not a coincidence.
3. Weevil being captured and meeting doffy. Doffy is the puppeteer with weevil being the greatest puppeteer.
4. Doffy, weevil, and boa will join cross guild. Doffy knows about it since he is always given the newspaper, with weevils help he will escape with weevil and since weevil follows he would follow the puppet master doffy. Boa will join since she cannot stay on Amazon lilly as she stated with the chaoter hinting at croc being their afterwards since we see panels of what looks like sand.
5. Marco dying and as a result awakens his fruit ability that brings him back to life (the power of the phoneix) but as a child. This sets up Marco joining the strawhat crew as the new cabin boy