Given how much Kid, Law, and Killer have been featured in the last 10+ chapters, it'd be so weird if they weren't on 100 or 101, especially when Oda made room for Big Mom's random homies and that bigass Ace.
I thought that they will be there on Vol. 100, but knowing they already appear in 96, it seems to often for the characters which not the central of the whole story (and just appear in the middle of making Sabaody more interesting).
Completely on board with some of the most important Volume become a homage for the Center of story, the Strawhats themselves