Board Thread:Naruto Discussions/@comment-12509038-20140806073433/@comment-26302001-20140806122114

Yeah, he gave Kakashi all of his Chakra, it went into Kakashi's optic nerves and awakened his Sharingan. It's the same as Hagoromo giving Naruto and Sasuke his Chakra.. Except Kakashi got ALL of Obito's chakra.