Board Thread:Naruto Discussions/@comment-2156952-20140715101620/@comment-24531362-20140717092545

NeedleJizo wrote:

That does make sense. I'm guessing Naruto's Yang Release should have been able to fix him up, though.

I don't think he's used it on Obito. Crucially, I don't think Obito would want him to. He's trying to do what he thinks is the best way to repent: die. Same reason he tried the Outer Path: Samsara of Heavenly Life Technique waaaaaaay back when; he feels (rightly, to an extent) that he cannot do enough good to undo the bad he did as Tobi/Madara, and sees giving his life to help Naruto as the only way he can be redeemed.