That I know, and I’m well aware of Rogue One’s production woes and extensive reshoots. But it would seem to me that this isn’t an “unfinished effect,” simply because all the other footage set up for tracking shows Guy Henry with a full head-rig: absent here. I posted the question to make sure that this is Henry as Tarkin, which it sounds like everyone is in agreement on.

Everything past that is speculation, but I think it’s evidence that they shot his scenes with the actor’s real face as a backup. (And I for one would love a cut that reinstates those, even though I know that’s not happening. The CGI Cushing is an insult to a great actor, and especially after Andor’s success, it’s a bit of a shame for such engaging television to lead up to a extremely tasteless tech demo John Knoll should have been talked out of).