Board Thread:Naruto Discussions/@comment-28294008-20160424155402/@comment-3965545-20160428110113

No, it's more simple than that. Hag and Hamura are each half of Kaguya who IS the TTJ basically. She originated and has the Rinne Sharingan which is both Sharingan eyes power put into a Rinnegan basically. Sasuke already has Hashi cells thanks to kabuto, so that is indra plus ashura = hag. Now Hag was a TTJ meaning he had his mothers chakra in him.. he was host to his own mother. So he gave half of that chakra to Sasuke meaning Sasuke gained some Kaguya chakra since it was mixed in with Hag's due to Hag being her jinchuriki. So Sasuke has a Rinnegan that is given his left MS Sharingan powers hence the tomoe. It is a bootleg Rinne Sharingan, meaning it is nothing but a Rinnegan with his MS powers in it thanks to the temporary Kaguya chakra that helped him awaken it. If Hag never gave him half of his chakra then Sasuke would have awakened the Dual Rinnegan and he would not have tomoe in them. It's only a cosmetic change to a normal rinnegan to signify that it can use his left eyes abilities in it.