The way I see it, Ridley Scott is nuts.
Really.
As much as I want to avoid an
ad hominem argument, I do feel that Scott's character should be called into question. When he was working on
Alien, one of the things he had proposed is that Ash should be a Martian. Two of the producers who own the franchise took Scott aside and clued him in on just what kind of universe
Alien was set in. Another daffy notion Scott had was that the film should end with the alien biting off Ripley's head and speaking with her voice. He also made some other weird assertions about
Alien which are best left in another discussion.
Scott not only admitted to not knowing that much about science fiction (one of the main reasons why they kept Dan O'Bannon around even after his screenplay was rewritten), but he had also admitted to disliking the genre.
Fast forward to the production of
Blade Runner. Harrison Ford had gone on record as being puzzled over Scott's declaration that Deckard was a replicant: "We had agreed that he definitely was not a replicant," Ford said.
So, to summarize: we have a guy who doesn't understand nor like science fiction who waffles on the humanity of Deckard. Yeah. I'm really going to listen to
him.