Zoro's attack vs Ryuma was Hiryuu Kaen (Flying Dragon: Blaze):
The attack he uses now vs Kaido is "Flying Dragon:
Fire Blaze":
I'm guessing it is an upgraded version of Hiryuu Kaen (along the lines of Shi ShiShi Sonson, 360/720/1080 Pound Cannon, Kokujo Ou Tatsumaki, Ichidai Sanzen Daisen Sekai, Rengoku Oni Giri, Torou Samon and Ul Tora Gari).
The remaining preskip techniques of Zoro that I'm most looking forward to upgrades of:
- Rashomon
- Gyuki Muzume
- Nigori-zake
I think those three are the most powerful of his preskip techniques that he has yet to display upgraded versions (
@Zenos7,
@Light D Lamperouge am I missing any?). Of course, there's Asura, but it appears to still be Zoro's Trump Card, and if the rooftop battle is destined to end in failure, I don't think Zoro will use it here.