Board Thread:Naruto Discussions/@comment-25139119-20140705022956/@comment-5936871-20140705195849

I believe Naruto gave Sasuke some of his and Kurama's chakra for a brief period so that Minato could teleport everyone outside of Obito's barrier by using Kurama's chakra as a medium when he launched 4 TBBs at everyone. However, I don't think simply transferring your chakra to someone will make it permanently stay in them and allow Sasuke to awaken the Rinnegan. I think it has to be done genetically since cells can produce chakra too. Which is why although not confirmed, I believe Sasuke must possess Hashirama's cells in order to permanently have Asura's chakra merged with his and that would explain why Sasuke was able to see Hagoromo in his mind.