I know Shanks used it against the sea king‚ but do you think when Oda drew that‚ did he had haki in mind to be introduced in the future or it was like ' shanks is so strong he can intimidate sea kings' but haki was never the plan until later.
Characters like Crocodile who went against Whitebeard and Lucci who was CP9 not mentioning haki or seemingly using it once ( maybe cause they weren't against a logia) implies it wasn't set as a concept yet
Characters like Crocodile who went against Whitebeard and Lucci who was CP9 not mentioning haki or seemingly using it once ( maybe cause they weren't against a logia) implies it wasn't set as a concept yet