Board Thread:Versus Debates/@comment-25122992-20161209152835/@comment-734582-20170105115026

Ravenlot 27 wrote: Firstly, @Thekillman, I have no idea why do you think that Obito could use Susanoo/PS in this state. When he obtained double MS he could do Susanoo. But we've seen what Susanoo does to your body (just see Sasuke) and when Obito had his double MS, he was already busy dying. Activating Susanoo at that point would almost certainly have killed him (well, earlier anyway).

The other condition (Madara's Rinnegan) is plausible. The same argument applies once more (You don't want to go into war exhausted from Susanoo), but there are also other considerations (rinnegan grants six paths, and he already barely used those), including the time factor (Nagato had 20-ish years to perfect his use of the Paths. Obito had, what, days?) and after-effects.

Secondly, @Namikazenaruto9, an ability to become a Jinchuriki isn't exclusive to the Uzumaki clan only. Okay, there was such a term as "compatibility" with the Beast mentioned in the series, and it was stated that Uzumaki have chakra suitable tob supress the Biju, but nothing more. I mean, there was nothing saying that Obito isn't compatible, since he never tried to become a Jichuriki before in the first place. And as he successfully managed to became a TTJ and gained the full control over it after some time, it proves that his compatibility was good enough. Moreover, it could even be not a question of compatibility. For example, Edo-humans were able to become Jinchuriki (Obito's SPoP), while Ten-Tails could be sealed only in a living human, as Madara noted. So it's pretty possible that not all the rules of regular Jinchuriki apply to a TTJ, and vice versa.