Before I start, I'm just gonna say I'm most likely wrong, but just hear me out) if u guys remember back to when Sasuke was starting to use his EMS (specifically when he was killing those Zetsu) he had certain bits of Itachis Memory in his eyes
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(sorry, new to the picture thing -.-) Madara is the only other known uchiha member to have EMS, so what's to say Izuna had a will to be at peace with the Senju (probably not, but you never know) and Madara knew this cos he has Izunas memories?