Board Thread:Theories and Speculation/@comment-4080775-20151225185754/@comment-25122992-20151225191332

Come on, I remember it, and it's probably some kind of error. While Obito could've trasplanted real Sharingan eyes to the SPoP Jinchuriki (cause he had a lot of them in the laborary), it was literally impossible for him to find 6 spare Rinnegan eyes. "The only ones in the world who managed to awaken the Rinnegan are the Sage of Six Paths and Madara Uchiha" - these are BZ words, which are the main proof of only two pairs of Rinnegan eyes existing in the ninja world at that moment (+ Sasuke's left eye, which evolved into the Rinnegan already afterwards). We don't know the fate of Hagoromo's Rinnegan, but judging by the fact BZ had to make another person awaken the Rinnegan we can say Hagoromo made them impossible to reach or use. Madara's Rinnegan eyes travelled from him to Nagato > Obito > back to him again. As a result, we have only two Rinnegan eyes which Obito posessed during the FSWW, one of them became his left eye, the other one was hidden away by him, so there's actually no Rinnegan eyes he could transplant to the reanimated Jinchuriki (he had to have at least 6 eyes, even with with all the Rinnegans shown in the series it's not enough).

If it'd be so easy to produce the Rinnegan, BZ didn't have to struggle entire centuries with making someone from Uchiha/Senju awaken it. The same with Madara and Obito. Rinnegan is kinda powerfull tool, if anyone would've found the way to reproduce it, we would have a lot of Rinnegan users, yet there were only five shown, and three of them even wielded the same Rinnegan eye(s) (Madara, Nagato, Obito). And if we remember that doujutsu (Sharingan/Rinnegan) reflecting in the eyes, which don't have it, is usually the sign of someone being controlled by this doujutsu wielder, it's logical to assume it's just normal.