Board Thread:Naruto Discussions/@comment-1512913-20170417105433/@comment-734582-20170421182348

Elveonora wrote: Interesting. While not siblings, they are both Indra incarnates, so perhaps it would have resulted in some kind of reaction, like Super Eternal Mangekyou Sharingan :D It's fun to speculate, but going by my earlier arguments it would either stay an EMS for a while or Madara would overwrite it into a Madara/Itachi EMS.

But Madara was already kicking ass pretty hard, so the main outcome of Madara getting eyes is that he would be even harder to beat (imagine Juubi Jin Madara with Amenotejikara)