Board Thread:Theories and Speculation/@comment-3001903-20160420024250/@comment-734582-20160421195052

I want to point out that Madara may have been able to manifest Susanoo without eyes because of Sage Mode. It makes sense considering that Sage Mode can also control the Nature energy in one's vicinity (e.g. Kabuto did it with the cave) and it seems the eyes function purely as a mediator to project the jutsu. That is, the eyes are used to cast Susanoo but not the only thing that can do it.