I am predicting it right now! Hyuuga clan is the distant relatives of the Uchia clan, like the Uzumaki is to the Sunju. Let me elaborate. It was stated by Kakashi that the Byakugan and Sharingan are related, in correlation to the Rinnegan. The color of the Rinnegan and Byakugan are similar. Their ability to recognize chakra natures. Its perfectly reasonable to say that the sage could see the chakra network because Madara posses that ability. Otherwise how else would he know that naruto was a shadow clone when Kakashi with the Sharingan cloudnt? I am also stating how maybe the two sons where the perfect form of their respective gifts. I.e. the son with the "eyes" had both the ying and yang chakra. So the Hyuuga got the ying " light" chakra and the Uchia received the yang "dark" chakra. This would also mean that the brother with the "body" had the ying and yang chakra. So the Uzumaki got the "light" and the Senju got the "dark". Madara has the dark eye chakra of the sage and by absorbing hashi cells he got the dark body chakra of the sage, thus unlocking the eyes of the sage. But that's only the beginning of the Rinnigan. Note the Jyuubi eye with the Sharingan like tome. I'm proclaiming naruto will either get Madaras eyes from Tobito or Sasuke gives him his eyes thus giving him the dark "eyes" of the sage and by being an Uzumaki already giving him the light "body" of the sage in turn making him the full reincarnation of the sage. Then he will absorb Bee and the the Jyuubi and under the new united ninja nation end the cycle of hatred in the ninja world. Or atleast be a huge reason why not to start any shit..... see what I did there?