I mean, I can't think of the details of how Oda will gonna execute the scenario. Likewise, I can't think of a scenario how Kaido's defeat is realistically communicated. No one saw him being defeated, his body still sticks in that hole. What happens next? Maybe, Kaido will barely conscious crawl out of the hole, just to collapse, being officially knocked out. Maybe after that, subconsciously, he will start a rampage in his dragon form, trying do to collateral damage, maybe he will try to escape from Wano, saying he will come back, which is the moment Zoro slays him. I don't know to be honest. But then again, Luffy being announced the winner while Kaido resides in a hole and after that will be jailed in Kairoseki, doesn't sound satisfying either. We talk about a guy who enslaved Wano for decades, with the dawn and liberation of Wano being foreshadowed with Kaido being taken out, with Kaido being taken out causing massive shifts in the world. Doesn't sound fitting for Kaido to just rot in a cell.