At the end of the last manga chapter, Chopper and Nami were shown and they appeared to be safe and in good hands. The fate of Sanji, Brook, Momonosuke and Caesar are still unknown but Nami seems to have grave news. He hugged Luffy as soon as he saw him and she was crying. Zoro was shown to notice something on Nami before all of this happened but the chapter ended at that moment.
A lot of people seem to agree that something bad has happened to Sanji and that whatever happened involved a fight against Jack of some sort. Some of the theories predict that Sanji was captured by Jack and subsequently the Marines or that after a tough battle his life is now so close to death that not even Chopper can save him. What do you think? What happened to Sanji? And where are Brook, Momonosuke and Caesar?