User blog comment:DancePowderer/Haki Problems/@comment-1949750-20110119214056/@comment-1949750-20110120061450

No no, That's not I mean. after Luffy attacked Blackbeard in Impel Down, I thought Blackbeard commented on Luffy's Haki's being stronger than before because he felt Luffy's haki (or the strength of Luffy unconscious use of haki due to extreme anger).

Sure Blackbeard must have heard about Haki due being in the New World with Whitebeard's crew but I think he said that comment b/c he senses Luffy's haki. Anyway, I didn't say that this is a confirmation of Blackbeard being a haki user, I am just presenting the possibility of him being one.