Deckard is a Replicant

I didn't know Deckard was a replicant. I just watched Blade Runner again, with the audio commentary by Ridley Scott, the director of the movie. He explains it quite logically.

Because Gaff, the origami guy, was in Deckard's apartment at the end and because he left an origami unicorn, he obviously knows that Deckard secretly dreams of unicorns. He knows it although Deckard never told anyone about this dream, this fairly private memory, not even Rachael, at least on-screen. And because Gaff has this background of government occupant / police cop he must have read a file - or the file - about him. Which means that there is a file, probably containing all the implanted memories among other information. So Deckard, the Blade Runner who hunts replicants, is a replicant himself.

There are other hints throughout the movie, like when Deckard and Rachael meet for the first time she asks him if he has ever tried the eye-scanner on himself. And some more hints. I can understand if you don't agree with this conclusion as I'm not as convincing as Ridley Scott, but I think it's true. It makes sense. Very much. To me at least.

Btw: also interesting how Ridley connects this film's universe with the one of Alien in his head ... pretty recommendable this audio commentary. Although it is a bit lengthy at certain points. I've definitely listened to better ones.