1] The Uchiha had no way of knowing they would gain an entirely new ocular jutsu just from transplanting someone's eyes; it's pure coincidenceSo once an Uchiha someone obtains MS they need to transplant their sibling's eyes into their self. but what is stopping two siblings from exchanging eyes? Why couldn't Izuna and Madara simply switch eyes to both get EMS?
2] Izuna died anyway from his wound
3] Plot doesn't allow both brothers to exist with eternal eyes.
That scan proves it's a merge? You'd only be insulting your own intelligence.they must merge, fuse together to create EMS.
this scan proves my claim:
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