Board Thread:Naruto Discussions/@comment-4080775-20180410150203/@comment-734582-20180411120603

Elveonora wrote: If they were evolutions of each other, they would be no sibling doujutsu, but parent-child to each other. Yup. A Mangekyou can still use Sharingan powers, but a Rinnegan can't use Sharingan power.

Edo Madara reverted to EMS to genjutsu Ay, debunking the latter. Madara used Susanoo without eyes, showing MS isn't necessary (and so, Rinnegan Madara + Susanoo is not proof of the latter). Only Sasuke can use them concurrently, but that's the operative word here: if he loses his Sharingan power, he also loses the tomoe. Elveonora wrote: The reason for this is that most Rinnegan users had started with the Sharingan before they awakened the Rinnegan, thus creating a false impression that their Sharingan evolved into the Rinnegan or that the Sharingan is a necessary requirement. Two out of three confirmed, the third uncertain. Hagoromo simply inherited both KKG, so that's not much proof. Madara is the only one who actively tried, and that's because his inferiority complex and dream made him fit to try and get that power. Sasuke didn't know about it, but Kabuto ensured he'd get that power. Hagoromo ensured he could concurrently use both powers. And Kabuto used Sasuke because he mistakingly believed Madara proved the Sharingan-> Rinnegan route.

It's sample bias all the way: Madara happened to get it, Sasuke got it because of reinforcement of bias (even on Hagoromo's part).

Elveonora wrote: That's the most common misconception that the Rinnegan can come from the Sharingan. It's because Kabuto stated that theory in the manga, and the circumstance imply that the theory is right. It's only through circumstantial evidence that we learn it's not the case. Although really, madara reverting to EMS to use Genjutsu should've been a bigger red flag back then.