I disagree. If I were a non uchiha and I recieved Hago's chakra, I would unlock Rinnegan max. But if I were an Uchiha and unlocked the Sharingan, then receieved Hago's chakra, I would have Rinne Sharingan (assumption)Well, the manga has only shown Susano'O to be the special case among the MS techs, even Madara without eyes was able to use it and Itachi with regular eyes was able to use it. Nagato not being able to use Susano'O also supports the argument that Rennigan can't access all MS abilties, further establishing both eyes as being diffrent.
Of course there's a connection, and yes, sharingan's potential can reach Sharinnegan if you're an Indra/Ashu combo, but that would be like sayin' wood style's potential is reaching Shinju level. It's true, but rather pointless.
And it is clear that the Rinne Sharingan > Rinnegan.
Wait? I don't even know what I'm arguing about now lol. I can't even tell if I'm making sense of things XD