His Last Attack indicates that he learned a New Style which is "Three Dragons Style"
So not only we have yet to see Full Capabilities of this Style, but we also haven't seen how other Techniques were Upgraded
Let alone Asura
In my opinion, Zoro only showed 60% of his Full Current Capabilities against King
And there is still Room for more Power Ups this Arc, with Black Blade & making Asura a Lasting Mode
Zoro is too strong Post-Wano
Mark my words, He will be sent to Impel Down Post-Raid