Seemingly, yes, but we've never seen his eyes without the rinnegan as they were always covered by his hair. Good point regarding Oro, but I guess we are to believe that he, like us, never saw his eyes at that time.Yes earlier in the Manga Nagato had seemingly normal eyes and could activate Rinnegan with stress early on.. If you think about it if he did have Rinnegan 24/7 when he first met the Sannin do you really think Orochimaru would have let that possible expirement escape his grasp?