However i think this one hour battle might parellel the present time as well. Luffy and co need surprise attack on kaido + bm alliance.
Any extended time will just bring stalemate and reinforcement .
Oda knows that luffy is not at kaido level yet but he needs to show kaido s defeat.
@Sadistic Senpai here gave real good scenrio. Oda needs to bring kaido all out in this fight. If he gets reserved and straw hat alliance takes time. Theres likely they will lose or sure.
I can see it possible to take down kaido but with big mom i am not sure what oda will do with her. Will she play devils advocate or join kaido .