Board Thread:Theories and Speculation/@comment-1512913-20150221101637/@comment-6769189-20150221203205

Madaras Rinnegan could still access his MS powers, but Obito and Nagato didn't. So havin access to Rinnegan powers doesn't necisserily mean having access to its MS powers. Also everyone with the Rinne Sharingan had Kaguyas charkra/chakra from the Shinju. Maybe that is key.