Why wasn't the Susanoo used?


During their fight with Kaguya, Obito, or even Sasuke didn't use their Susanoo
which could have protected them from Kaguyas "Bone Ash" jutsu.

Same is the case when Sasuke fought Madara (Tobirama was lying on the ground
paralysed and Sasuke jumped from above to attack Madara). Sasuke could have
used his Susanoo, but he didn't.

Was this just a loophole on the writer's part? Or is there a reason behind it?




Kaguya can absorb all forms of ninjutsu, which rendered Susano'o useless.
Sasuke only uses techniques like that on people who dont absorb jutsu, like
Naruto. Plus, there would be no need to use Susano'o on Madara's Limbo Clone
because physical attacks do not work on it. When he had chances to use
Susano'o against Madara's Limbo, he didn't understand how the jutsu worked and
might have felt there would be no need for its use. They have recently been
putting Sasuke in situations where he doesn't need to use his stronger jutsu,
like Kagatsuchi or Susano'o, which is why his fights have started taking way
longer than they should be.

As for why Obito can't use it, there is literally only one manga panel that
completely sums it up. [![enter image description
here](https://i.stack.imgur.com/NqoFF.png)](https://i.stack.imgur.com/NqoFF.png)

Obito had already given Kakashi his left eye by the time he awakened Mangekyou
Sharingan, thus couldn't use Susano'o. Obito is later seen to get back both of
his Sharingan, but since he awakened it before he had both, I guess the eyes
could no longer be seen as a "vessel" for Susano'o to be used.

