Board Thread:Versus Debates/@comment-28869806-20150428191153/@comment-3965545-20150530161352

Itachi got his Mangekyo at 12yrs old thanks to Shisui "committing suicide". Nagato was awakened to the Rinnegan at 6yrs old according to DB4. He didn't consciously use its power until he was about 10. He was 18 when Yahiko died. Nagato mastered the Rinnegan but it took a long time since he was not the originator. Itachi has Sword of Totsuka.. that's his only shot at ending Nagato because visual Genjutsu does not work against the Rinnegan and he can absorb Amaterasu(and by theory Susanoo) like Madara did against Sasuke. Itachi's brain and his Sword of Totsuka are his lifelines here.