its not a contradiction, it did evolve because it didnt start off as a sharingan as time passed and generations passed it evolved into what we see todaySo if the mangekyou evolves to rinnegan that means it contradicts the story madara told of the sages son's rinnegan evolving to the sharingan wtf? :/ Who the hell is the guy in the mask!!
Actually this is very probable. Little brother getting revenge for big brother. Someone posted that the Uzumaki clan was wiped out earlier because Tobi was upset with them, but based on your theory Orochimaru could have done it trying to attempt to find someone that could under go the experiment, and thats why the 4ths wife was really sent to the Leaf. And all that was found was Nagato but Izuna got to him first, hmmm..here goes my theory of what transpired.
1.Madara fought Hashirama
2.Madara got some of Hashiramas DNA during the fight and with that somehow learned to activate the Rinnegan
3.To Use the Rinnegan properly,one has to have enormous amount of like giving Chakra.That's why you need the Sage "body".only an Uzumaki/Senju has this.
4.Madara revives Izuna with the Rinnegan but overexerts himself since he does not have enough life giving chakra for this.
5.Since Madara does not have enough Chakra,The Izuna that he revives is only a shell of his former self.
6.Knowing he'll die if he revive's Izuna,before his death Madara left intructions that Tobi(Izuna) has to find an Uzumaki(Nagato) and transplant the Rinnegan to him.Him being capable of using the Rinnegan properly.(or Madara did it himself before reviving Izuna,that is why he knew Nagato)
6.Once the Uzumaki(Nagato)child grows and learns to use the Rinnegan properly.He is to revive both Madara and Izuna to their prime.
7.But thing did not go according to plan,Unlike Madara which only goal is to bring the Uchiha out of the shadow of the Senju and to it's former glory.For Tobi(Izuna) it's all about revenge.Revenge to the rest of the Uchiha that betrayed them and Senju(Leaf village).In short it like Itachi and Sasuke(Itachi=Madara and Sasuke=Izuna)
8.Kabuto and Orocimaru learned the secret of the Rinnegan and the So6P(You need Life giving Chakra of the Senju/Uzumaki to activate it and properly use it.).That's why the Sage was able to master it since he both have the eyes and body.
9.Kabuto through experimentation with Orochimaru learned to manipulate Senju DNA and gave it to Madara's body.that's why he said "you were completed to beyond what you were in your prime"
10.That is why the revived Edo-Madara is able to use the Rinnegan properly.it is also why Kabuto is claiming that he created that power.
Please tell me if there are holes in my theory.
I Agree...The prefect body(Naruto) vs the prefect eyes(Sasuke) isn't that the fight that has been going on since the sage had his sons?
that research is really really good... bt as u said ... the impact is getting stonger and stronger ... lol.... ha ha.. good one broI am kind of pissed that how that little sh't Kabuto acquires power and takes credit for Orochimaru s researches. If there is a true genius in this Naruto universe it is not Sasuke nor Madara it is undoubtly Orochimaru I believe. I mean the guy died like 100 chapters before but his impacts is still rocking the world