Board Thread:Wiki Discussions/@comment-1512913-20140521221412/@comment-3568954-20140523090911

Elveonora wrote: The Rinnegan can also use some Sharingan-specific powers/techniques, like Sasuke's by Rinnegan-granted Infinite Tsukuyomi immunity Susanoo etc. not to mention Madara's Infinite Tsukuyomi reflects as Rinnegan in the eyes of the affected, despite IT being a Sharingan technique. But it's clearly used with his third Rinnegan, hence using power of the Sharingan with Rinnegan isn't that much of a secret code.

two seperate eyes its just that an evolved Rinnegan can still access the sharingan because its evolved notice that Nagato dispite being an uzumaki did not have access to any sharingan based powers if he did then he would in fact have displayed the abilities that a sharingan have