I guess you see it from the wrong perspective. Cause exactly this splits luffy from Kid. Luffy get everything told and teached, every legend around comes around and explains to luffy how to do it.
Kid on the other hand is going Into the world and is figuring it for himself. He used the Knowledge and abilities he has. Goes for kaido, loses and learns from this. How else shall he figure it? Looking for some cheerleaders spread all over the world? He goes the hard way, try and fail, try and fail, until he wins. And he is the guy who stands up every fucking time. Lost an arm to shanks? Who cares. Lost to kaido? Who cares. Up again. New idea, new technique. He figures a way, doesn’t matter how long it takes.