Board Thread:Naruto Discussions/@comment-3571355-20150819100444/@comment-3965545-20150824003345

What proof is there to back that up? Obito didn't use them. Madara taught Obito what he knows about the Rinnegan, who taught Nagato what he knows about the Rinnegan. The only OTHER reason I could see for them not being able to use Limbo is the fact that Madara only used it when he had Sage Mode/Senjutsu, before TTJ and as TTJ, but even then Obito was a TTJ and he never used it while having one eye just like Madara did. So it is simple, they didn't know the techs existed.