Board Thread:Rebirth: Applications/@comment-24019243-20140929212937/@comment-3030647-20141005105110

Well, even so, the manner in which you described his usage is akin to the way Tobirama and Minato used it. The only users of it in the canon, the Hokage's Three Guards, were taught directly by Minato and even then can't use it without being in conjunction with one another. What makes Iruzen any different?