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.