One of the most notable characters in Naruto is Zetsu. I don't know if it's just me, but I have developed a very keen interest towards Zetsu and his abilities. I understand that White Zetsus are all the human beings that Kaguya enslaved when she first cast the Tsukiyomi on an entire village. And I also know that Black Zetsu is the manifestation of Kaguya's will right before she was sealed by her two sons.
However, what seems to confuse me is that both Madara and Itachi stated that the only way to read the Stone tablet in the Uchiha hideout was if the person had the Sharingan or any of its derivations. Zetsu, on the other hand, was able to read it, and even made changed to the Sacred text left by Hagoromo while having neither Sharingan nor Rinnengan.
The Wiki states that White and Black Zetsu had both the Mangekyou Sharingan and Rinnengan but that is most definitely super wrong. Throughout the manga/anime Zetsu's eyes were shown many times and even during his fights with the five Kage and the Mizukage(while protecting the feudal lords in the 4th great Ninja war), he never showed the ability to use any Kekkai Genkai except Wood Release.
How did Zetsu acquire both the Mangekyou and Rinnengan (Before the time of the Senju and Uchiha clan)? If not, does this mean there are other methods to reading the tablets which Zetsu may have used?