We already know that Rikudous Senin have pass on his power to his two son before he die.We have not seen Rikudou wife to make any proper judgement of origin of Rikudou's sons.I believe Rikudou Senin did past his will to his son via ying and yang similar to Madara creating white and black zetsu.We seen how Madara will had influence on Nagato and Obito in the past.The reason why Obito was able to act like Madara because of Madara will was in him controling the destruction of the uchiha clan and konoha.
However for Naruto ,his uzamaki blood line is a distant cousin of senju clan ,therefore the senju bloodline in Naruto is very small.Narut need the a direct source of lineage from the tailbeast essence to inherit s06p will.Sasuke on the other hand is a pure Uchiha.There could be a possible that Rikudou will be reveal in Sasuke when he fight Madara,which will make him unlock the true uchiha clan power of the rinnegan or elder son eyes
However for Naruto ,his uzamaki blood line is a distant cousin of senju clan ,therefore the senju bloodline in Naruto is very small.Narut need the a direct source of lineage from the tailbeast essence to inherit s06p will.Sasuke on the other hand is a pure Uchiha.There could be a possible that Rikudou will be reveal in Sasuke when he fight Madara,which will make him unlock the true uchiha clan power of the rinnegan or elder son eyes
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