User blog comment:Ero-cook/Why didn't Ace get to learn Busoshoku Haki?/@comment-3075024-20110707213859

i think that he never felt that he needed Busoshoku haki power cause every enemy he ran in, he defeated them all with his DF power and his raw power. He also had a huge backup of Whitebeard Pirates so he never felt like getting strong to protect himself. Where Luffy felt that he needs to get stronger to protect people that he loves so he agreed to the Haki training. Ace never had that need or want.