We all know that Jinbe will join Luffy's crew eventually but he first has to settle some business. Now I prefer to think it concerns Charlotte. There seems to be some link between them , Jinbe being the strongest fishman and Charlotte claiming fishman island. So my theory is that Jinbe made a failed attempt against Charlotte (either in a battle or perhaps in an exchange of words) leading her to capture him. What led to this I believe is that somewhere in their conversation Luffy's opposition towards her was brought up and maybe she mentioned the fact that she wants to destroy him/his crew. Jinbe tried to defend the Strawhats by mentioning how they saved fishman island and the fact that their his friends. Causing her to become angry and capture Jinbe. I think she is going to use Jinbe to oppose Luffy for a battle. But now she's only going to encounter Sanji , Brook , Nami , Momo and Chopper. I also believe that this is what will bring Jinbe to Join the Strawhats. That's as far as I got. Thoughts?