Lol come on dude its common sense.
Indra never had Rinnegan.
How do you know ?
If it would've been due to Hashirama, Sasuke would have 2 Rinnegans, not one.
Sasuke + Ashura's chakra + Near death experience = Standard Rinnegan + Hagoromo's chakra = 6T Rinnegan.
Amenotejikara is thanks to Hagger's power.
The viz called it much tinkered hashi cellsThis^^^ Why wouldn't it have affected both eyes as it had with Madara?
Maybe its both scenario's, hence why Sasuke has a Rinne Sharingan.