I did a reread of all the Egghead chapters after this came out, because there's too many fucking elements going on. Rundown of my thoughts:
1. The hidden villain is taking out all the Vegapunk's, which was CP0's original mission to begin with. Saturn is on his way. CP0 only report to the Gorosei (correct me if I'm wrong here). Therefore, only the Gorosei would've known about the mission. Kizaru was already on his way to Egghead. From my POV, signs point to another Elder, or Imu themselves.
2. Stella and Shaka both had a sense of impending doom prior to the Straw Hats arrival on Egghead, with Shaka mentioning his own death to Dragon. I think we're missing some context as to why that's the case. The VP's must have been made aware of the government knowing he was researching the Void Century. Who was the tip-off?
3. Everyone, from the Satellites to Sentomaru, are betting everything on Luffy getting Stella safely off Egghead, for whatever reason. Why? He's shown himself to be pretty reckless, but a lot of people believe in him. I think Stella will survive, but I think everyone else left on Egghead is getting killed (if Oda actually breaks formula and kills off people). This includes all of the satellites.
4. Caribou was not happy that he was being released onto a government island. His words were "You'll pay for this!". Chapter 601 he was also seen using a pistol, similar to the one used on Shaka. (Sorry, bad at adding images here).
5. The Navy/WG are going completely fucking overboard (with the exception of Garp lmao) to destroy Egghead/VP. I don't think we've seen so many forces trying to get at one character so much before. He's such a high priority asset, just like Kuma. VP's been mentioned by Old Stussy, Judge and Caesar have seemingly stopped fighting to team up against him, the Gorosei, the Admirals, Bonney wants him dead.
6. There are constant parallels/mentions of Ohara here, and Lucci referenced Lulusia as CP0 pulled up. I think we know how Egghead is getting destroyed, God Laser Death From Above. Just depends if Punk Records itself will be destroyed.
7. Shaka mentions this is all an "elaborate plan" to kill the VP's, but I think it's more just a few people who wanted him dead all happened to be on Egghead at the same time, and unintentionally unite. I don't think any of the VP's are behind a betrayal.
Overall, I think this arc just has so much shit going on, but I'm starting to understand why Egghead is the beginning of the end. Most of the story is converging on this old-timer. He has a lot to answer for, and I hope he gets the chance to do so. I think we'll see Egghead hit with Imu's Orbital Laser Cannon/Uranus/whatever the fuck it is, Bonney finally switch to being pro-VP after seeing Kuma's memories, Kuma potentially destroy MJ/the Red Line at the same time as Egghead's destruction to level things off and officially kick off the Final War.
I still don't know what purpose Kizaru/Saturn will serve. I do hope the SH Grand Fleet pulls up to deal with the Navy. I have more thoughts but this post is long enough already lol.