If Luffy is going to find a new nakama on Egghead, than what we need to do is, to look back into the story and how Oda used to introduce new Straw-hats in the past. So, let’s see, what similarities I can find if I compare how Oda as of now has introduces new nakamas in general:
- New nakamas are most times introduced at the beginning of an Arc/Saga. (- On Egghead this could be: every Vegapunk, Bonney, Lucci, Stussi, Kaku)
- Luffy interacts with them most times at the beginning on an Arc/Saga in one or another way. This is an interaction Oda focuses especially on. (- On Egghead this could be: Old Punk [Conversation], Bonney [Saved from the sea], Lucci [fight])
- As the story progresses, the plot slowly starts to tighten around the nakama-to-be (I think we are at that point now in the Arc. With the development of the next chapters, we surely will see who Oda’s plot is focusing on.)
- With the evolving of the story, the reader is introduced to a deeper problem surrounding the character that is also the explanation of how he/she acted and interacted in the past with the crew. We see a flashback.
- The problem is solved by Luffy beating some main villain into the ground. (A little crudely worded but it’s true.)
What the story mainly stated so far: I personally think Luffy will face Kizaru. I don’t know why he is coming to Egghead and I am really intrigued what his order is, if Akainu mentioned that his depature to Egghead was planned: Is he to take control of the seraphims? How is he going to do that?; Is he to officially find out about the death of Vegapunk because he `casually´ dropped by to find the old man killed? Or has he other orders?
Then there is the strange behavior of Lucci. He is disregarding orders given to him and deviating from protocol. Why? He even confirms this on his own but gives no fucks and it even angers Kaku a little.
What gives me the creeps is Stussi: She knows certain things about Egghead and its technology. At one point she must have come into contact with it. I don’t know if she had infiltrated Vegapunk’s laboratorium before or if she remembers it from the past – from a certain void century. (Fact is – she keeps her age a mystery and I wouldn’t be surprised if she is immortal.)
In any case, I would link her knowledge of the tech directly with CP0’s orders to kill Vegapunk. I would say, she has found out somehow that Vegapunk has come across forbidden knowledge and informed the WG, which then in turn sent their assasins. It looks to me, that Vegapunk has in fact a great problem at hand. But he seems not to be the fighter, everyone of the Straw Hats is. So, either the old man can do combat in one way or another, or the plot will slowly turn in favor of Bonney or Lucci.
I personally think there is going to be a twist in the story: Lucci is not acting rational and focused on his duty at all, like we are used to be seeing. There is more to it than we know (I can see a problem evolving here somehow.). Meaning something is different with this mission we as reader do not know, yet. I mentioned the similarities of Shaka’s and Lucci’s body-postures before. The fact that Shaka hasn’t taken off his helmet also tells us, the face underneath it will be a surprise for us. I think that he and Lucci are somehow related and that this relationship has been found out somehow by the world government as well (Maybe when Stussi was on Egghead to spy on Vegapunk.). And Kizaru could be sent to Egghead simply because he is to kill Lucci afterwards.
The problem Bonney has is still too one-dimensional for me. I hope it will develop throughout the plot.
All three are candidates.