Board Thread:Naruto Discussions/@comment-5054236-20150717003436/@comment-3568954-20150718183020

LegionZero

No there is nothing said about needing the uchiha eyes first

the only thing said was that you need to unite Uchiha and senju power then it was retconned to say uniting indra and asura's power which can be gained by tissue or cell transference but in this case hagoromo gave both his power

he more than likely would have to awaken a sharingan first but since he has hagoromo's chakra if he ever awakens the Rinnegan he would naturally awaken his own sharingan as the sharingan is a power indra gained from asura who gained it from kaguya

also if he were to take sasukes DNA he would still eventually awaken the Sharingan, mangekyou sharingan than Rinnegan

nothing in source material says you actually need the sharingan first by the way(Just Indra and Asura's power)