So in the end, unless Saturn continues to try to do something or Kizaru betrays the WG (which seems unlikely now), the arc is pretty much over. Next chapter will answer that question though.
And here we are back to the comments we were making a year ago, but Ill say them again: Saturn needed to live in order to deliver the mother flame to Imu. That is his directive. If Kuma and/or Bonney actually end up joining (imo Kuma is not dead and will recover; he has a very thorough strawhat-esque flashback), then they can close that loop on Saturn down the line.
I am curious about Stussy, Sentoumaru and Kizaru though. This arc feels extremely Zou like in the sense that it was a plot dump exposition with no true antagonist to lose against. A bit weird considering it didnt actually close a villain arc here (neither Saturn nor Kizaru). But again, we'l see how the next 1-2 chapters go. I assume we'll be in Elbaf or "Warland" by 1125 or 1126.
Overall though, outside of lore Im not too happy with this arc, lots of meandering. Zoro fighting a redundant villain was pointless. Exposition for the Gorosei was cool but again, nothing happened with them. Cant even describe my personal disappointment for the Marines there though lol. I guess they'll all be in Akainu's main force, but they wont get any screentime at this point anymore (except Kizaru).
I really hope Elbaf ups the focus. It better be about this 4th RP and the Burned Scar Man. Imagine spending another 4 years there and that doesnt get resolved lol...
Ways the arc can continue:
1. Lucci frees the Seraphim using the Bubblegun Stussy freed Kaku with. Seraphim can fly and easily catch up with the ship. Kizaru could, too, but, boy, have I given up on Kizaru doing anything here.
2. Blackbeard attacks Egghead. Knowing Teach he's monitoring the situation. Ace, a Fire Logia, was defeated by Blackbeard while trying to avenge his friend and protect his crew/captain, and old man. Kizaru, a Light Logia, just killed his friend. York would be SO valuable to Teach.
3. Sanji retreats to try to save Stussy
4. Labophase collapses, causing a Nuclear explosion when the Mother Flame breaks.
5. Imu sends Uranus to attack the Straw Hats (had plenty of time to do this if Uranus still has Mother Flame left after Lulusia).
6. Shiki or Enel attack Egghead (both connected to Ancient Technology).
Egghead began with the Seraphim attacking a pirate island they invaded, and Lulusia being destroyed by Uranus, with Sabo, Luffy's brother, another representation of the Sun, escaping.
Egghead will end with the Seraphim attacking the Straw Hats, fleeing a government island, and Uranus being revealed to attack the Straw Hats, I'd guess. But, S-Snake and S-Bear, because of Luffy and Bonney, will help defend the Straw Hats, and S-Bear will teleport everyone away. Ideally this teleport would be to Dragon on Kamabakka.