RIP Rocks D. Xebec. Great fucking character. How did his son Blackbeard turn out to be such a piece of shit with no honor lol? Awesome flashback that revealed a whole lot. Now we need to know how Newgate, Kaido, and BM became Emperors after this incident. When was the moment they were labeled as such and why?
We need to also know how Dragon took what he witnessed at God Valley and used it as motivation to become the leader of the Revolutionaries. This was easily the best flashback in OP history for me. I just wish the fight between Garp/Roger vs Rocks was fleshed out a little more, with additional named attacks and more than just slashes. At least it wasn't off-screened completely like the Akainu/Kuzan fight.
We still don't know what Roger or Rocks powers are. I guess they are just way better at using Haki than anyone else in the OP-Verse? Same with Shanks? Roger seemed to use "Divine Departure" like Shanks did.
I'm assuming next chapter we are back to Luffy, Loki, and that whole desperate situation on Elbaph with the nightmare monsters, evil Giants, and kidnapped children. Going from this flashback right into Luffy going to the surface with Loki is gonna be pretty damn hyped.
I do hope the Straw Hat crew eventually goes to God Valley before they hit Raftel at EOS. I don't know if Oda will want that island to remain a mystery in the present or not.