User blog comment:12th Supernova/Chapter 820: Payback/@comment-24850639-20160316153354/@comment-2125188-20160316174628

Well I personally think it's safe to assume Luffy will leave with his group while everyone else holds off Jack. I'm sure with Zoro, Law, Neko, Inu and all the other minks should be enough to deal with Jack (especially when you consider the state Jack's in).

As for Marco, he may be convinced to help if they tell him they're going after the Yonko (I'm sure he stills wants to take down Blackbeard)