Board Thread:Theories and Speculation/@comment-27821284-20160218112823/@comment-3965545-20160222133832

Its not the chakra she needs.. its the flesh. Sasuke had Hashi cells implanted in his heart to repair it. Madara implanted the cells in his chest wound too. They each awakened Rinnegan on the verge of death.. difference being that Hag gave Sasuke even more Hag chakra and extra shit etc so his Rinnegan is different. Hinata, Neji, Hanabi, would need Otsutsuki flesh implanted into them in order to eventually awaken the Tenseigan.. Hashirama could of awakened the Rinnegan if he took Madara Sharingan.. same with Naruto if he took Sasuke's eyes just like how Toneri took Hanabi's eyes. It's actually really simple when you think about it. Body + Eyes equals the physical + spiritual, the yang + yin. From early in the manga that was hinted at, explained.