Board Thread:Naruto Discussions/@comment-28450860-20160622145346/@comment-28819877-20160623113902

Shadowflame55555 wrote: I don't know about Tengai Shinsei, but Madara didn't teach anybody about Limbo because he wanted to keep it to himself as a personal trump card. His conversation to Obito atop the Ten Tails made it clear that neither fully trusted the other and both had their own reasons for what they were doing, and they would willingly sacrifice the other for their own goals.

Just prior to facing Might Guy, Madara did not want to use Limbo because he knew Obito could see it with the Rinnegan, so if he could have helped it, Madara would have never wanted the secrets of Limbo to be revealed to anyone.

Shadows from Rinbo cannot be seen without Rinnegan which no one possesses except Nagato before the war. Moreover, shadows are invulnerable unless you have Six Paths Chakra. Both Naruto and Sasuke didn't have it before. So in this case it doesn't matter if you aware or unaware of this jutsu because you have no powers to counter it.