Sorry if it's been made but it's how I feel right now so stfu about search bar lol. I Reread the fight between tobi and konan and when tobi said they were his eyes so he had a right to them it it me thinkin about it.
Madara was known to have been the one who unlocked the rinnegan and he claimed to have had it planned for Nagato to revive him so I believe that nagatos eyes are madaras.
Tobi says they were his eyes so he has a right to them. Thinking about tobi its obvious that he uses a sharingan in 3 tomoe form and has his teleporting ability that I obviously related to his eye. He most likely has MS but doesn't use it. Izuna possibly wouldn't use his MS because he watched his brother go blind due to the "curse" behind their use. This also makes sense when you think about what he said: "they are my eye anyways". If nagato's eyes really were madaras then it is true saying they were izunas because madara took izunas eyes.
This may also be a reason why tobi's power is related to obitos. It's far fetched but possible that instead of remaining blind and dying izuna took another sharingan, obitos and progressed it as Kakashi did to the MS level.
Anyone agree or have reasonable critiques?