If you think about it, Zoro's whole role on the rooftop was to be a human shield for the people who are gonna defeat the two Yonko (Luffy,Kidd and Law) and to take away 1hp to Kaido with his strongest attack.
And now he's K.O. with 30 broken bones, mummyfied on Sanji's shoulders.
Not much from a narrative point of view so I don't think his role in this war is ended already.
Him fighting an injured King after Marco is defeated or Queen seems possible to me.
I don't think he won't beat at least one main opponent in this entire Onigashima's raid, it would be too strange from Oda.