Board Thread:Theories and Speculation/@comment-734582-20150712141917/@comment-734582-20151208174308

Zilyane wrote: Like it supposedly happend with himself. The tablet said that real power is achieved when two sides cooperate. I believe that this is the original intent of the message, but Black Zetsu changed it so that Madara's alternate interpretation would work as well. If memory serves, Japanese can be quite ambiguous.

Hagoromo also stated that Kaguya had the Sharigan, and that by combining the chakra of the transmigrants his chakra could be remade. He also stated the tablet was meant to prevent that. So, i would expect him to know the difference between his Rinnegan and Indra's Sharingan.