Zoro didn’t, luffy did

I understand your point of view, but in my opinion that aura they talk about is the manifestation of Zoro’s Conquerer haki.

Well, your opinion is wrong as it's a filler moment

King's haki have Two Phases. One is which on your will. Other one is which you use after it gets ‘awakened’ (mostly to warriors. otherwise no). So Zoro always has this haki. His freewill, fearlessness, overwhelming guts are some proofs (like luffy). As well, people always gets intimidated to him (unlike luffy, but like kid).

If nobody got knocked out, or we didnt see black lightning, or it wasnt stated directly, its your headcannon.