Now that we’ve estabilished this, we can move towards the conclusion of the theory. Sabo mentions in chapter 794 that he is the one that made Luffy’s vivre card and he took a piece of it:
This is it. Now that Vivi is hunted down by the literal king of the world, there is no way she would survive normally, she’ll be killed if she goes back to Alabasta somehow or any other place; so she goes to the only “place” where she will be protected no matter what: back to the Straw Hats. There is literally nothing else she can do. How will this group (Vivi, soulless Kuma, Lindberg, Karasu, Morley) reach Luffy? Well, Sabo has Luffy’s vivre card. Why would the officers of the Revolutionary Army escort Vivi back to Luffy? Well, because there is an unresolved plot point that goes all the way back to Dressrosa. Remember why the Revolutionary Army was in Dressrosa in the first place besides the Mera Mera no Mi? They were trying to track down weapons that we found out were actually made in Wano by Kaido and Orochi. So this already solves 2 plot points: Vivi’s long awaited return to the crew and the Revolutionary Army finding out the origin of these weapons.
Let me take this a step further: a popular theory is that Vegapunk will come to Wano after the war is over, in a similar way to how Garp went to Water 7 after the CP9 arc. In support of this it should be remembered that Sentomaru is the first character in the story to have a japanese-y name; he is also the first one whose name is written in kanji, not katakana or hiragana; he has an attire (the rope thingy in particular, also worn by Oden and Yamato) that screams Wano, and he is the personal bodyguard of Dr. Vegapunk (Wano and Vegapunk connection).
Furthermore, Momonosuke ate a “failed” artificial devil fruit that was made by Vegapunk, NOT Caesar (connecting once again Vegapunk to Wano); we constantly meet people who might be connected to Vegapunk (Judge worked with him, Queen takes note on how Sanji is Judge’s son); we have a whole army that is known to be fearful because of the man-made devil fruits they ate and Oda mentions in SBS 48: “For more detail, you’ll just have to wait for a certain professor to make his appearance in the story, and explain exactly what the Devil Fruits REALLY are… Eventually.” And lastly, Vegapunk gets namedropped in Wano!
There never was a better time for Vegapunk to make his appearance. If this does indeed happen then a lot of awesome development will follow: Kuma will finally get back to his normal self because of Vegapunk (remember that he is a genius and also the same man that turned Kuma into a cyborg, but he was also respecting Kuma’s wishes, like the order to protect the Sunny) as there is no way that Kuma will just stay like this for the rest of the series; we will finally learn what his backstory is, why and how he was framed by the World Government and his connection to Jewelry Bonney; the Straw Hats will also finally have the chance to thank Kuma for what he did.
And finally, in a super-saga in which the devil fruits have been one of the main focuses, we will get the long awaited reveal to what devil fruits are and how they work. I hope you can see how this all makes sense and is not forced at all in my opinion; of course predicting One Piece is extremely difficult but I think this theory is pretty reasonable, even if it turns out to not be correct.
*Theory by UniversalNexus