Board Thread:Naruto Discussions/@comment-4682609-20140806081616/@comment-5407586-20140810120904

ShiftyTwin wrote: Is there a slight chance that after having it for that long in his system, it still had Obito's Uchiha cells in it? If what was trasplanted were cells, I'd agree with you. But all Kakashi got was an eye and optic nerves. No chance of cell contamination like what happened with Hashirama's cells and Orochimaru's (Kabuto). Also, when Kakashi killed Rin, he and Obito developed the Mangekyo in the same moment, which hints at a connection between them that allowed Obito's "special chakra" (which is produced by Uchiha brains in moments of mental strain and despair) to go to Kakashi's eye and allow it to evolve further. The reason Kakashi could achieve Susanoo is because Obito apparently transferred all his ocular abilities to him, like what Itachi did to Sasuke but to a far greater extent.