So you're saying cells from a dead bidy is as potent as if they were alive? Why would Hagaromo mean before Madara died when it shows young Madara as he said Madara created a problem? Madara out lived Hashirama so that means he had to get the DNAS when Hashirama was alive and still had Ashura's chakra in him. Had Sasuke awakened the Rinnegan with Ashura's chakra he would have both regular Rinnegans like Madara.
Manga said Indra got the Sage's eyes which gifted him with powerful chakra and spiritual energy (Yin). Also if Sasuke awakened the Rinnegan then why can't he deactivate it? Or lower it to lower form like EMS or 3 Tomoes? Madara who did have Ashura's chakra was capable of changing his Rinnegan to EMS and 3 tomoes yet Sasuke can't as he turned his EMS back to 3 tomoes and not his Rinnegan. He even had to close his eyes for a whole chapter and some of the beginning of the next chapter like Kakashi had too with his MS. So with that said it's easily to see Sasuke does not have Ashura's chakra.
Hashi's dead cell is deadly to whoever implant it into one's body and can create a massive forest neg diff in a second, that is very potent. Madara created a problem, because so6p doesn't want him to get rinnegan. When madara finally awaken rinnegan, so6p consider that's a big problem
If so6p gives sasuke his chakra/eye, sasuke could have two rinnegans as well, so one eye sasuke doesn't prove anything.
Indra's doesn't have sasuke's yin power because sage himself said he didn't give indra anything, and tried to change the cause by giving sasuke something, only to says sasuke is still a failed experiment like indra even after he spoodfed him yin power(he neglected indra before)
Well we never seen madara nor nagato nor so6p nor kaguya switched rinnegan back to normal eyes
Why he closed his eyes?? It's the same as part 1 itachi has to rest years after one amaterasu shot