Board Thread:Wiki Discussions/@comment-30516921-20140513231113/@comment-1458758-20140514021632

Not necessarily. Knowing how to Counter a Jutsu and how to perform it are very different things.

Madara himself possesses a Sharingan, knows about this technique and has been shown to battle Tobirama in the past. Given the sheer amount of prep this technique requires, it's quite likely that he never saw Tobirama perform the technique, but there are numerous circumstances under which he might of seen Tobirama be forced to undo the technique, such as if his own Edos were turned against him or through the accord with the Uchiha it might have required him to undo any he had left or even just to show them how to avoid Tobirama using it against them again.

Basically, much like a court of law, there's reasonable doubt that Madara doesn't know this technique and as such, we don't add it. It's pretty much how we roll around here.