since zoro cut the horn , let me give my views on this
-this gate can accommodate a number
- kaido's size to that gate
- number's size = oars at marineford , u can scale him to the size of that broken passage ( he can be a little smaller but it doesnt really mater much tbh )
- kaido's size to a horn ( u can even scale momo with it , since he is literally sitting there so there will be no difference in perspectives and angles )
- zoro cutting the horn
so yeah zoro can cut marineford in half with his range and aoe attack