Board Thread:Naruto Discussions/@comment-25051328-20140818021248/@comment-24519434-20140819210258

Sasuke stated he had three Mangekyō Sharingan powers to awaken Susanoo. "The third power... Susanoo." Kagutsutchi is merely manipulation of something a water release jutsu is Suiton: Kagutsutchi (basically its not even a jutsu), so that can't be the other power. He dosen't have Kamui or Kotoamatsukami so he must have Tsukuyomi.