User blog comment:Dettles/Questions about haki/@comment-8823907-20130620114043

First to the question of if you automaticaly can use both types of haki. Well Rayliegh said that people usualy pick one and try to master that one. I would like to give you an example like the mantora on sky island. When fightinf luffy Enel, didnt bypas luffys DF so he could only use the observations haki. So know you have to train both to be able to use them.

Secondly how do people who dont have teachers learn it. Well if the person has or hasnt got a teacher it doesnt realy matter. The person needs to unlock haki first, example Coby. Even though trained by Garp when he unlocked his observations haki he didnt know what was happening so the same thing probably goes for the others. At some point they notice that they have unlocked a certain ability and try to train it. But this doesnt mean they werent influenced by others. Law could have learned about haki rom Vergo or Doffy himself when he was Jokers subbordinate so he could have been trying to unlock it.

Question about where was Fujitora and Vergo and possibly the third new admiral during the war of the best. Well even though the marines did call most of their forces it is a good bet that they would leave some forces out there to hold the fort. G5 is the first base in the New World so it probably is wery important for strategical purposes so they wouldnt want to weeken it. Fujitora however i have no idea about. I have a theory that he was retired somewhere and Akainu or Kong asked him to rejoin the marines.

Last point about the black limbs. Well i dont realy know. Maybe it is there just so Oda would give more of an emphasis on the fact that the person usin it is like wearing an "armor" and maybe he didnt think of it during the WB war.