We all know that Oda is a master of foreshadowing, but what will happen when One Piece is near its end?
There will be less foreshadowing, and instead Oda will entertain us by recreating some of important past events. Of course not exactly the same and not in the same context but in similar and impressive way.
Sanji left the others to deal with his own problem just like Robin did.
Momonsuke communicated with Zunisha just like Shirahoshi did with Sea Kings.
And in the recent chapter 822, Luffy dragged the others jumping down to Sunny or the sea (whatever his plan), just like he did in Enies Lobby, dragged everybody to Rocket Man.
Next chapter, I think Oda will recreate how Luffy got a seventh member when Robin sneaked into Going Merry after Arabasta Arc. This time, a seventh member again has already sneaked into Sunny to follow Luffy in his journey to rescue Sanji.
Who is he/she? I will give you clues..
1. She is a woman
2. The first Mink we met in the beginning of Zou Arc, but she is nowhere in the recent chapter, 822.
3. She can reach Sunny very easily because she can jump very high.
4. She mentioned that it is fun to sneaked into Big Mom tea party in chapter 815.
5. Last clue, she was in the Sanji rescue team poster:
*Theory by gaimon