Board Thread:Theories and Speculation/@comment-1512913-20150221101637/@comment-25549954-20150301092818

Madara didn't have eyes or Mangekyou activated when he activated his Susanoo, similarly Itachi didn't have Mangekyou Sharingan activated when we have seen Susanoo for the first time, so it comes to conclusion that eyes aren't needed at all after the initial activation of the two Mangekyou.

My theory is that Kakashi still has Susanoo as a gift from Obito, after his first activation of Mangekyou there is a change in chakra pathway that will allow him to access Susanoo.

Sasuke used Rinnegan: Genjutsu on tailed beast and they had Rinnegan reflection in their eyes similar to person affected by Infinite Tsukuyomi, I believe Infinite Tsukuyomi is more like a Rinnegan Genjutsu.