Oh, it was always my thesis theory. It was one or two people who were relevant were… I can’t remember if Hampton agreed with me or not. But I remember someone had said, “Well, isn’t it corny?” I said, “Listen, I’ll be the best f***ing judge of that. I’m the director, okay?” So, and that, you learn — you know, by then I’m 44, so I’m no f***ing chicken. I’m a very experienced director from commercials and The Duelists and Alien. So, I’m able to, you know, answer that with confidence at the time, and say, “You know, back off, it’s what it’s gonna be.” Harrison, he was never — I don’t remember, actually. I think Harrison was going, “Uh, I don’t know about that.” I said, “But you have to be, because Gaff, who leaves a trail of origami everywhere, will leave you a little piece of origami at the end of the movie to say, ‘I’ve been here, I left her alive, and I can’t resist letting you know what’s in your most private thoughts when you get drunk is a f***ing unicorn!’” Right? So, I love Beavis and Butthead, so what should follow that is “Duh.” So now it will be revealed [in the sequel], one way or the other.

-Ridley Scott

http://www.ign.com/articles/2017/06/22/blade-runner-turns-35-ridley-scott-discusses-the-films-legacy-deckards-true-nature-and-the-future-of-the-series