I am asking myself a thing lately i wondering how Kabuto obtained DNA of Nagato for his Impure World Resurrection, i think it must have bin after his death because the most people (even the Akatsuki) did not know of Nagato they only knew Pain.
In http://www.narutobase.net/manga/Naruto/521/4 Kabuto said something about "That" other Jutsu and "eventually i will learn the secrets of the Sage of the Six Paths!"
The Sage of the Six Paths did have the Rinnegan so could Kabuto have one to(The right one) maybe he took them both and put some fake in it xD.? Or did he do someting to the Rinnegan with knowing that Madara wanted the Rinnegan?
Does he want to know the secrets of the Sage of the Six Paths to counter it?
Or to have the powers like the Sage of the Six Paths (if thats so i dont get it why he did not take the Rinnegan)