Board Thread:Naruto Discussions/@comment-3232093-20140617193601/@comment-2172835-20140821125953

You're essentially saying the same thing, which makes this entire thread so funny. You're say devolution while another says evolution. Essentially to break it down you're say:

Shinju/Kaguya = Single Rinnegan with Tomoe -> Hamgoromo = Dual Rinnegan no tomoe -> Ashura/Descendants = Sharingan/MS

What others are saying in reverse order:

Uchiha = Sharingan/MS -> Madara = EMS -> Madara = Rinnegan with no tomoe

In both there is a direct link between the Sharigan and the Rinnegan, in both senses evolution and devolution has occurred. To better clarify there is a sense of progression from the Sharingan to the Rinnegan as well as the opposite. Now back to the original point, did Hagoromo possess the Sharingan? From speculation alone from this and my previous points I would say he did/does. But obviously just speculation. But the point regarding the evolution or devolution (which I think the term progression and regression would be a descriptor of the events) from the chain of events it would seem both have occurred.