I predict something like this, either Zoro or possibly Kin'emon (fire v.s rock!) stay back while Luffy advances towards Doflamingo. It'd be epic if Luffy and Zoro both advance towards Doflamingo, even though Zoro v.s Fujitora will end with Zoro loosing, Fujitora is still in the palace, and Luffy rushing there in alone will end quite badly (he'll be up against Fujitora and Doflamingo).