Board Thread:Naruto Discussions/@comment-3232093-20140617193601/@comment-4271790-20140821170855

And to answer the thread's overall question, (and to beat on a dead horse) yes, Hagoromo probably did have the Sharingan, and his own special chakra allowed him to awaken the Rinnegan eventually. It's just that his "special chakra" went to Asura, and his presumed Sharingan went to Indra.