There is one thing that I don't quite well understand. How come Kakashi know about Amaterasu technique. Did he see it before? I have no recall or whatsoever that Kakashi saw it before. In the Naruto series, we only able to see twice Amaterasu. One is during his encounter with Jiraiya and the other one is during the battle between the brothers. Even Jiraiya didn't know about Amaterasu.
