Also, the part where he says “Luffy’s crew of ten” is also interesting to me, because Luffy currently has nine people with him.
That has always kept the fanbase guessing. Is it 10 including Luffy or 10 excluding Luffy?
I always hoped it was 10 excluding Luffy, but I am not so sure. I don't see how much value adding another member would bring at this point in the story unless it is someone so heavily tied into the current plot. Which leaves only Vivi. There is no other potential Straw Hat in the whole of One Piece that ties into the final plot lines more so than Vivi, she is already considered part of the crew anyway.
Now I think of it as, Does Vivi need to join the Straw Hats? Could she fulfill her story line with Imu without needing to be a part of Luffy's crew?
Or can her story continue in parallel like it has been?
The only ways I see her properly joining is after a bit more information is released that:
- She finds resolve that leads her to needing to be alongside Luffy to experience the truth.
- She becomes the damsel in distress and Luffy saves her.
- She has something to add that will help take down Imu.
Other than those, she really doesn't need to be a part of the crew.
Given how Vivi is so tied in, she still has to qualify, I don't think Oda is going to be able to drum up a more fitting case to add to the crew he is already breaking up often to get through an arc.