Board Thread:Naruto Discussions/@comment-25139119-20140705022956/@comment-2039297-20140718230022

The mere fact that the Rinnegan affords one the capacity to use certain techniques doesn't mean the wielder can in fact use them. Think about it: Obito didn't demonstrate the ability to use more than about 3 Rinnegan techniques even in situations where they would turn the tide (the Absorption Seal technique, Shinra Tensei, etc.), and Madara only used about the same number of techniques. Just having an eye doesn't mean you can automatically make use of all it's capabilities, you still have to master usage of those abilities (in this case, Nagato).