Board Thread:Naruto Discussions/@comment-3279282-20140418093252/@comment-3279282-20140419114802

Huh... I expected more answers. Aaaaanyhow, as far as I remember, it should be like this:

Sasuke, using the Sharingan, could read about the control of the Nine-Tails with the Mangekyo Sharingan.

Madara, using his Mangekyo Sharingan, could read about the Rikudo Sennin, his deeds and the full history of Chakra. What's more, he could read about the two sons and the awakening of the Rinnegan, too. I think that's what Madara meant with "secrets of his body".

The question is, while Obito could read the same with his Mangekyo Sharingan, what exactly is written there that can only be read with a Rinnegan?