It was confirmed long ago by Oda that Haki has many levels. It isn't as simple as three abilities that offer the same level ...
Game Rant on MSN
Say Hello To Monkey D. Luffy's New Haki Upgrade
Luffy has a huge haki upgrade ahead of him in Elbaf. This upgrade will allow him to fight against immortals in One Piece.
The Straw Hat pirates will have more than just two conqueror's haki users in One Piece. Some, however, have more chances of awakening it than others.
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