Where are the 'bots?Whorl

Hey, what ever happened to Sand, Hammerstone, and the rest of the soldiers when the 'Cargo' left the whorl? Was this just meant to be left hanging, or had they served their purpose and their time was finished? But that doesn't quite fit, because Moly left the whorl with the humans. Would they still need chems after they had settled on Blue? I'm also unclear on why the chems have such human personalities if they're just machines. -Steve *This is WHORL, for discussion of Gene Wolfe's Book of the Long Sun.