H
Attacks with usual black lightning is common in OP among fighters of high and decent caliber it’s not necessarily about CoC, it’s also a means to show a said attack or clash is strong. Otherwise the number of CoC users is gonna triple which isn’t happening.
and the majority have the potential of having CoC haki.
for example Sabo as brother of Luffy and Ace and the second in the Revos
Sanji as the left hand of Luffy and Zoro's rival in the crew
Sai as Don Chinjao's grandson
Jinbe as a warlord and strongest Fishman at least one of them should have it Jinbe has the potential.
Ulti as one of the few people in her crew who trash talk to everyone even to kaido himself.
and Elizabello's attack would not make any sense if it was anything but CoC haki. it is basically advanced CoC but since Elizabello is too weak he needs an hour to infuse his punch with CoC haki