Board Thread:Naruto Discussions/@comment-434627-20160705183726

When Madara used the Transcription Seal: Izanagi to negate his death, he hadn't implanted Hashirama's cells into his body yet - after all, that's the whole reason he started the fight in the first place. But since Obito states that you need Senju powers in order to use Izanagi, I'm confused as to how this is possible.

Actually, since Itachi implies that using Izanagi was once a regular occurrence among the Uchiha, it's even more confusing to me. 