When Sasuke battled at the Kage Summit, everyone seemed to know about Mangekyo Sharingan and Itachi's skill with it. Considering how rare MS is and how secretive Itachi was, how could they possibly know so much about it? Back in part one Jiraiya was Konoha's number one information gatherer and Kakashi was the most revered of Jonin with a sharingan himself, yet none knew about it. Yet as soon as Sasuke got it, all of a sudden people have knowledge on it. Cee could even recognize Amaterasu and judge that Sasuke's skill with Amaterasu surpassed Itachi's. How? Did Itachi go around spamming his MS? How would Cee of all people know? If Itachi was using his MS while Cee was viewing, how the hell is he alive? Heck Kakashi even recognized Susano'o. I can understand someone like Danzo knowing, but how and where did they get such knowledge?