Board Thread:General Discussion/@comment-25436862-20150610034332/@comment-12180476-20150617155446

That may true, but Hiruzen has decades of experience combined with the ability to use potentially hundreds of jutsu and the knowledge of several others, particularly techniques such as Izanagi. For all you know, he may have the ability to create a defensive maneuver/technique that mimics the Susanoo's durability. Besides, I think he has more than enough knowledge in that head of his to defeat Danzou 11 times.