Eh, I’d rather old man Ewan. It’s a lot less footage to replace and Guinness would probably have preferred his involvement be forgotten anyway.
I’d rather neither. Ewan was cast because of his resemblance to Alec. Nobody needs to be “deepfaked” to sell it, since they’re playing the same character at two very different points in said character’s life.
Also, I wouldn’t mind if Alden Ehrenreich ranted on social media about deepfakes trying to “erase” him.