All that has been proved so far is that everyone involved had ears. But I'm sure someone will be able to definitively prove what the ear whorls on an actor looked like 80 years ago. If it can be definitely proved beyond all doubt what a movie looked like on a thousand different movie screens using a thousand different projectors with a thousand different bulbs some 60 years ago, I'm sure he can definitely say what stunt man portrayed what part in a long shot on 18 grainy and blurry frames of film.