You know, given that he was well past his peak fame by 1927, it might actually work (kinda like Daniel Craig's cameo as a stormtrooper in The Force Awakens). I don't think we've even seen a William Hart film, though, so he wasn't available according to our rules.
Update: We saw Henry B. Walthall as Richard Arlen's disabled father in Wings. Definitely would have been a strong choice for Obi-Wan or Tarkin.
How about William S. Hart for Greedo?
You know, given that he was well past his peak fame by 1927, it might actually work (kinda like Daniel Craig's cameo as a stormtrooper in The Force Awakens). I don't think we've even seen a William Hart film, though, so he wasn't available according to our rules.
Nevin thinks you need to do Red Squadron. :)
Fatty Arbuckle as Porkins.