- Zoro will need the high-tier santoryu attack, think Tatsumaki (dragon-twister) or Ichidai Sanzen Daisen Sekai (the upgraded version of Sanzen Sekai, which defeated pica).
Kokujo O Tatsumaki isn't a "high tier" Santoryu attack.
What made that attack useful against Kaido was the fact that Zoro unleashed Enma.
Something like Iai Shi Shishi Sonson or Ichidai Sanzen Daisen Sekai should be a lot stronger if he unleashes Enma with it.
- Personally, I don't see this happening, as King was capable of blocking/clashing with ultra-tiger hunt, as if it was just a normal sword attack.
Ultra Tiger Hunt is not a strong move at all.
King dealing with it isn't impressive.
See
my explanation.
2) Ashura (9-sword style) - Jest of the dead (亡者戯)
- This is the new move that scarred Kaido, which Kaido complimented by saying you have done more than enough.
- Personally I think this move can definitely KO King, but I have a feeling that Zoro won't be using this technique. The reason is because I think this is a special ashura move used by zoro when he is very closed to dying. 亡者戯 can be trasnlated as Jest of the dead, or dead man's game. As its name implies, the user is probably in a near-death condition to use it. Can King push zoro to near death condition? Possibly? But to the condition of 30 broken bones by hakai? Probably not.
Moja no Tawamure isn't a regular Asura move, it's an Asura
Bakkei move, meaning "Asura sword draw".
It's the same idea as Iai Shishi Sonson "Sword Draw Lion's song" and also the stronger version Iai Shi Shishi SonSon "Sword Draw Death Lions' song".
So the move that Zoro used to scar Kaido is likely stronger than normal Asura moves.
3) Ashura (9-sword style) - a new technique
- On one hand, Santoryu doesn't seem to be enough to take down King, on other hand Jest of the dead seems to be a move only used in near-death situation by Zoro. This leads me to think that in order to defeat King, Zoro will have to unleash a new Ashura technique. This attack is at least as strong as 亡者戯 (jest of the dead), and can possibly be a bit stronger.
If Zoro uses a new Asura move, it probably will be a regular Asura move, and it would likely be weaker than Asura Bakkei.
Overall, I think we have to wait and see how King fares against Zoro once Zoro has started to unleash Enma.
And what I mean by unleashing Enma is:
This fire aura is what Enma looks like when Zoro is unleashing his Haki through it. Zoro got Kaido's attention each time he did this with Enma.
However, against King, he still hasn't decided to unleash Enma.
He's still only using the minimum amount of Haki needed to coat the blade in black.
So I say we should wait and see how King fares with Zoro unleashing Enma.