Asura is basically like obelist the tourmentor's destiny punch when his power level reach infinity or Ra's Phoenix Form aka a sur win if it hit. once why oda never allowed zoro to use it consistantly let alone spam it.
Following the pattern from pre TS and the two Asura instances...
First, it appeared against a Zoan enemy and successfully took him out.
Then comes an opponent with nickname King in his prime, against who Zoro doesnt use Asura.
And finally comes a Pacifista against who Asura failed due to Zoro's bad state.
Now we come into post-TS where the order is reversed...
First we had a Zoan enemy against who Asura failed due to Zoro's bad state.
Then the opponent with nickname King came against who Zoro didnt use Asura.
And right after him comes a guy who is the firepower source of the Pacifistas who will be taken out by Asura.
Zori vs Kizaru shall be glorious.