User blog comment:Will od D./manga 599/@comment-1211470-20101006211706/@comment-3060121-20101007023424

It was said that Raylirgh taught him everything that he had to teach. What if rayleugh only meant to teach him the basics and that's it. After all Luffy wanted to find out if one piece was real or not on his own, maybe he wanted to master his haki on his own. Then the haki Luffy has is difficult anyway Hancock who is a kuja cant fully control it and she knew about haki and had more years to train.