I wonder if Big Mom will survive. We know Kaido should since he was introduced as an invincible character (one that can't be killed). Big Mom never received that introduction. That makes me believe there is a high chance Big Mom die which will force Kaido to go on a rampage and start destroying the capital.
That will set uo stage for Zoro return to fight Kaido to stop him for good by killing. So far nothing and nobody has been able kill him. Only way to end a rampaging Kaido would be to kill him.
I see what you are doing Oda I like it. I would allow Wano citizens to see Kaido's end and allow them to view Zoro as the next Ryuma by having him recreate his legendary dragon slaying feat.
It time that everyone be honest. Zoro's plot line in Wano is not over. He still have much to do.