Original Script - Definative Proof?
Now bear in mind the many of the lines in the film were improvised by the actors, and /or changed by the execuitives as the film was made, and not by Ridley. And that the story was essentially based on Fancher's script, you have to say that Deckard was intended by a majority of the principals to be Human.
Ridley coming back to the film after a period of years, and making his humanity ambigious, is not I think sufficient proof, that he was replicant all along.
In summary have Human = PKD, Mr Fancher, and Mr Ford, The Actors and Executives
Replicant = Mr Scott.
minor points....'You've Done a Man's Job sir' Is unambigous praise when spoken by an Englishman, or in this case a man with english colonial roots, and intonations.
'Too bad she won't live, but then again who does' implies either Deckard, or Gaff, or the longevity termination would Kill Rachel. In the Original Script Deckard does it.
NB Also the original script DOES have Deckard voicing over, so the myth that this was added by the studio after the film was made is not true.
Ian