Zoro back in DR:
"Plan 1: Shoot some slashes... Nah, it's too far to be effective. That won't knock him out..."
Zoro now:
Look at the freaking distance which the air slash travelled to cut the horn which is far thicker and bigger than the mountains there. By the way, the mountains are around the 500 - 600m range which is actually even more impressive since Zoro's air slash travelled a few kilometers - you can put several of these mountains within the range - and it STILL had enough power to COMPLETELY CUT THE HORN.
I'm actually very proud of Zoro to see how much he grew since DR.
Zoro cutting Mt. Fuji is incoming!!