User blog comment:Kaido King of the Beasts/Chapter 813: Up in Vinsmoke/@comment-5398287-20160121132556/@comment-24769684-20160121151641

There's no evidence to suggest Jack will return. If anything, Luffy will carry Jack's atrocities in his memory for a future battle, because honestly, I don't think he's at Jack's level yet. I also REALLY do not want the crew split up again.

But yeah, there are still loose ends on Zou to be tied up, most prominently Raizo. Given Luffy and Zoro's apathy to Sanji's note, a rescue doesn't seem incredibly imminent.