Board Thread:Theories and Speculation/@comment-26636534-20150921160743/@comment-3568954-20150925092449

another requirement is to have the power of both uchiha and senju. Madara could only complete izanagi because he took a bite out of hashirama in there fight. Obito could use it because he had Hashirama's cells in him, Danzo also had hashirama's cells

so that means kakashi wouldn't be able to use izanagi because he only had the sharingan and not the sharingan plus senju cells