Before I start, I want to warn you that this is just food for thought, and should not be taken too seriously! IF you're gonna be butthurt or go "didn't read lolz" leave now, thank you. Enjoy!
I'll split this thread up into sections so that it's a bit easier to read, and not just a big hunk of text for y'all. The "theory" will be split into sections titled 'Sharingan, Rinnegan, and Susano'o' and 'transplanted eyes (with dojutsu)'
Sharingan, Rinnegan, and Susano'o
I'll split this thread up into sections so that it's a bit easier to read, and not just a big hunk of text for y'all. The "theory" will be split into sections titled 'Sharingan, Rinnegan, and Susano'o' and 'transplanted eyes (with dojutsu)'
Sharingan, Rinnegan, and Susano'o
As most fans of this series know, the Rinnegan is the next stage of the Sharingan.
While using the Rinnegan, it is safe to say that one may also use Sharingan techniques, as we see Madara using his Susano'o while maintaining his Rinnegan:
This obviously shows that one doesn't need to have the Sharingan activated in order to use the Susano'o if they have a Rinnegan.
You must be registered for see images
You must be registered for see images
You must be registered for see images
Transplanted Eyes (with dojutsu)
The two people with transplanted eyes that I am going to focus on here are Kakashi and Nagato, as they are THE MOST important when it comes to this part of my 'theory'. As we all know, Kakashi has an implanted Sharingan from his former friend, Obito. Kakashi's Sharingan evolved into a MS after a tragic incident, the death of Rin.
Along with unlocking the MS, Kakashi was able to use it's abilities - copying and the Kamui. Obtio himself also uses the Kamui.
Additionally, Nagato's Rinnegan was originally Madara's.
Like Kakashi, Nagato was able to use his implanted eyes' abilities the same as the original owner. So in my opinion, it is safe to say that one who receives eyes from someone else is able to use their abilities.
You must be registered for see images
You must be registered for see images
You must be registered for see images
Tying it all Together
Kakashi was able to become the famed "copy ninja", as well as evolve his Sharingan and use the Kamui with implanted eyes. Nagato was able to master the Rinnegan and use all 6 Paths with implanted eyes. Seeing as Madara's Rinnegan is an extension of his MS, and seeing that he was able to use his Susano'o while maintaining his Rinnegan, I feel that it is logically reasonable for Nagato to be able to use Susano'o with Madara's implanted Rinnegan.
Please read it through (a couple times if you have to) and give me your thoughts on this. Thanks for reading.