Obito survived billions of paper bombs.. Ur mistaken.. Danzo's version was imperfect.. Obito's version was perfect.. He could use it for over 10 minutes.. It's more than 1 instance , lose ur ego n listen, Izanami was a jutsu meant to counter Izanagi.. It's like a yugioh card meant to counter a nother yugioh card.. The only difference is that izanagi can also have an effect outside of Izanagi. but it's not stronger than Izanagi..n to break izanami is easy.. Its the same way I'm telling u.. Lose your ego..n u break it -_-