| I think one the possible ideas is that Rachel was the fifth, and Deckard was the sixth, reprogrammed as a Bladerunner and kept under surveillance by Gaff, who was the 'real' Bladerunner of the story.
I always got the impression that Rachel was Tyrell's "pet" android and had been with him a long time, but that could be simply due to the fact that she had been reprogrammed with his niece's memories, and that she was more advanced than the others. |