I sort of thought that he was the Nexus 6 that got "fried" (i.e. the "brought out of retirement" bit) and they reprogrammed him with memories, and Rachael was the missing 6th Nexus 6 rep.
Who knows, however. It's a story, and if the creator doesn't know . . .
Hello,
I've got a question about Pin numbers, or the absense thereof. I did accelerated mathematics and recieved a pin number. The problem is that I lost it thinking that I didn't need it anymore, but it seems that I do. Does anyone know how to get your pin number?