Board Thread:Theories and Speculation/@comment-1872728-20151019025302/@comment-27074627-20151023124633

Thekillman wrote: Georgio722 wrote: My point is, how do you know that Obito never manifested his Susanoo? Shisui did manifest his with only one eye, even though it says that you need two eyes to manifest. Sishui had both eyes. He also had MS in both eyes. Obito gave away his eye before MS was achieved and before Susanoo could be manifested.

Because once Susanoo is completely manifested, it can be used without eyes. Thekillman is right, you need both MS eyes to awaken Susanoo. Just to awaken. If you've done this, then no matter whan happens to your eye(s), you still can manifest it (Madara with no eyes at all is the most obvious proof to this, as well Shisui after his right eye loss, although UNSR OVA actually isn't cannon material). So Obito had no chance to awaken Susanoo until his left eye return, but we can monitor him all the way from the moment of regainind conciousness thanks to Naruto up to the moments of his death, there's no sign of him awakening Susanoo.