Really? Even now? Like oda goes out of his way to put Zoro on that roof to do nothing?
Assume it doesn't happen as you say, what do you think would've been the purpose if all this? Like Zoro goes on and on about fighting Kaido for all of ongashima, he reaches the roof,gets knocked out immediately, wakes up and is in front of ING and fights king and the arc ends.
Like what do you think was the point of this if something like the above were to happen?