As Oda has made very clear the Wano Arc is about more then just beating the Yonko and freeing Wano. It’s about advancing the story of the Void Century, the Rocks Pirates, God Valley Incident, Ancient Weapons etc.
As such, when it comes to the Straw Hats, no one is more influential to this story then Nico Robin given her unique translation skills and her knowledge of the One Piece World’s history as well as the perspective she gained working with Monkey D. Dragon. Duke Dogstrom even made mention of this on Zou for those who remember, and I’m sure Oda included this for a very specific reason.
In Chapter 999 Big Mom tells Kaido he is free to kill all of the Straw Hat Pirates except for Nico Robin. Kaido asks Big Mom if Charlotte Pudding can read the Poneglyphs, but Big Mom says no and she doesn’t want to wait anymore.
Even if Kaido and Big Mom were to be defeated by the end of the arc, to me it would only be through the intervention of a very powerful 3rd party (CP0? Blackbeard?) whom would share a similar interest in Nico Robin, and as such their strategy towards Robin would still end up driving alot of the story.
What are your thoughts about the role Robin will play?