Listen, if you want to believe that Who's Who is coming back for a fight, fine.
But just think for a second how beaten this dude just got.
He has an ancient saber tooth devil fruit, he was in hybrid form, he used all of Rokushiki skills that can damage (even upgraded versions of them), the only thing we don't know from spoilers is if he was using CoA.
Now just think about everything that Jinbei did.
1, Jinbei was able to dodge the Madara Shigan, that made the enemy say he was pretty fast for a Gyojin on land. So then, Jinbei was able to match Who's Who speed.
2, Jinbei's defense started overwhelming Who's Who, to the point that Who's Who broke HIS OWN finger attacking Jinbei.
3, Jinbei took a DUMP on Who's Who backstory, telling him to shut the fuck up.
4, Jinbei took a fucking Rankyaku to the face in close range like it was nothing.
5, Jinbei did all of this shit while Who's Who subordinates were watching and were just hyping him up.
6, Jinbei grabbed the man's wrists and broke them like twigs.
7, Jinbei made Who's Who get shocked from all of this and made him RUN AWAY AND FALL BECAUSE JINBEI WAS HOLDING HIS TAIL WITH HIS FOOT.
8, Jinbei destroyed his fucking lair / floor with a single hit.
IF Who's Who is not defeated in this chapter, this dude is still completely HUMILIATED. Not just him, his entire fucking family tree is ruined after this display by both Who's Who and Jinbei.
Unless he wasn't using Haki or he has an Awakened Form, wich is weird to me that he decided TO RUN AWAY in the middle of the fight if he had these other cards to play, this fight is done on a spiritual level.