So after a couple of days of thinking about this I came to the conclusion of what will happen in the final arc. So Y'know how devil fruit users aren't allowed to be on the island because they get sick. Well I think that Luffy won't get sick because of the Hito Hito no Mi (Model: Nika) and how it's basically the islands fruit. I think that Oda is teeing this up for the original 5 to be on the island (Luffy, Zoro, Nami, Ussop, and Sanji) because Brook, Robin, and Chopper are going to be sick if it goes in tradition for most devil fruit users. But I believe that Franky, and Jinbei would stay back for them. However I have a feeling that somehow Blackbeard will break the system. But anyways I think that Oda is going to make the original 5 straw hats be at Raftel.