So its just a theory, but it has high chance of being true.
Just like Kimimaru, Kaguya has same dot marks over the eyes and they both share Bone KKG, marks are basically indication of it.
Indra too has those marks, he's been said to inherit strong chakra genes of Hagoromo and it possible that Bone KKG DNA has skipped hagoromo into Indra just like sharingan did from his granny Kaguya.
Now i understand why Ashura needed Sage's power up in order to draw with Indra
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Just like Kimimaru, Kaguya has same dot marks over the eyes and they both share Bone KKG, marks are basically indication of it.
Indra too has those marks, he's been said to inherit strong chakra genes of Hagoromo and it possible that Bone KKG DNA has skipped hagoromo into Indra just like sharingan did from his granny Kaguya.
Now i understand why Ashura needed Sage's power up in order to draw with Indra