That explains why there wasn't lightning when Zolo used Asura yet
Ad.CoC user Kaido says Zolo used Ad.CoC.
Since Zolo is not a DF user or Cyborg, the only logical explanation is;
Asura light illusion = CoC Haki lightning variant
If you disagree, then explain
how Zolo creates 2 more heads and multiple arms from his spirit
without CoC Haki, can other people create Haki illusions without CoC Haki?
Chopper sees Zolo's Asura illusion:
So its actually an illusion that can be seen by everyone not just by Zolo's opponent.
Before you say no one got KOed by Pre-TS Zolo's CoC, of course no SH Pirate was going to get KOed by Pre-TS Zolo's CoC when even top tier Rayleigh's CoC couldn't KO Law's Pre-TS crewmembers:
Similar to fodders seeing black lightning of 5 Planets, they said fodders can't see it if it was Haki, thats not the case.
Fodder Flampe can see CoC Haki as well:
Does CoC Haki includes Demon Spirit/Aura?
If Asura is not a CoC Haki light illusion then explain what it is.
Edit:
Shanks's CoC Lightning creates Griffin Illusion: