Board Thread:Naruto Discussions/@comment-3571355-20150819100444/@comment-5407586-20150824191303

Madara couldn't copy Amenotejikara and Sasuke couldn't copy Limbo. Some might say that it's because they didn't have the time, but to me it looks like Itachi trying to learn Obito's Kamui despite not having the actual eyes capable of casting such jutsu. Obito and Nagato had Madara's Rinnegan, so they should've been able of using the jutsu displayed by the original owner, if they knew about them. Madara didn't tell Obito about Limbo, so it stands to reason that Obito and Nagato weren't able to cast the jutsu.