User blog comment:D.Dragon123/Why Haoshoku haki is useless./@comment-3177945-20130117150457/@comment-3425840-20130121072719

Well Ace had King's haki, but he did not show any potential of the other hakis. Similarly, many characters have other hakis but do not have king's haki. These implies that whether someone has King's haki is irrelevant to him possesing other hakis.