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It also depends on the version you got to know best.
Before the directors cut came out I saw the theatrical version about ten times and in that cut there is no indication that Deckard is a replicant. In that version the origami unicorn only meant that Gaff lets Deckard know he was in his flat and that he could have 'retired' Rachel had wanted to. For me what was powerful about the film overall was that a human, Deckard, is taught a lesson in humanity by the replicants, which to me was nicely ironic and ultimately quite moving.
Then Scott introduced the unicorn dream in the directors cut. Now there is a possibility that Gaff knows Deckard's dreams, but its still not conclusive. Gaff leaves origami animals around all over the place and it could be coincidence. In the end it's just a hint and ultimately I don't find making it concrete very interesting. You have a plot twist that in the larger scale of things reduces the story to a machine getting a lesson in humanity from other machines, which forsakes the ironies of the original message for a plot twist.
So that's where I stand.
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