Board Thread:The Panopticon/@comment-4028641-20151101035254/@comment-4139960-20151109192648

Danniesen wrote: Ingrid Oliver has said that keen-eyed Whovians are able to tell who's who.

But, as for the video recorded of the Zygon Osgood and human Osgood in The Zygon Invasion I would say that the one in the scarf might be the Zygon, and the other one would be human... I think

Steven Moffat has also said that he doesn't know which Osgood is which and he's only the official biographer, while Oliver herself said afterwards either she does or she can't say. And "might be" is not a valid source.