Well Kaguya finally has came and manifested her will, so I think in time those 2 will have to show up as well. This should make perfect sense since Ashura and Indra were just clinging on Naruto and Sasuke. Their will should manifest so that they take control and fight Kaguya because it seems that only them should know about their grannies.
So what do you think guys?
So what do you think guys?