Board Thread:Naruto Discussions/@comment-31480387-20170309081722/@comment-26773508-20170309094128

Ravenlot 27 wrote: Madara was the first one from Uchiha clan to awaken the MS, as it seems. And Indra doesn't belong to Uchiha, since there were no Uchiha in his age at all, but rather to the Ootsutsuki clan. So, Madara is just the first "documented" case of awakening the MS and the first Uchiha to do it. Indeed. I find it highly unlikely that some of the previous Indra incarnates didn't awaken the MS. Maybe the MS is rare. But then again, Uchihas suddenly started awakening the MS left, right and center after Madara and Izuna. It's fishy, tbh.