I think they were brothers. Madara & Izuna, Sasuke & Itachi are brothers, they all activated Mangekyou.....i think The mangekyou only appears in brothers so that EMS can be achieved...
Kind of makes sense why Kakashi's eye can now use MS and why Shisui was shown to have it....
It will be interesting to find out what that tablet completely says hopefully it is revealed.
Kind of makes sense why Kakashi's eye can now use MS and why Shisui was shown to have it....
It will be interesting to find out what that tablet completely says hopefully it is revealed.