Board Thread:Naruto Discussions/@comment-27227969-20160612184735/@comment-25442883-20160612220714

But we didn't saw ninjas with only one rinnegan using all six paths so its only normal to ask thing like this (not saying he can't either). There must be some limit in power between only one and double rinnegan.

Also we don't know how powerful Sasukes rinnegan is, is it equal in power to double 'normal' rinnegan. His is enhanced with MS abilities but its still one so we can't truly know.