Tailkinker

Answer: Jack and Victoria believe that they are there on behalf of the human race, so it makes sense for them to have a human face to interact with. Sally is a logical candidate - the Tet would presumably have intercepted her transmissions to the Odyssey and would therefore have plenty to work with in constructing their fake Sally as an interface with their clone workers. It's not made clear in the movie how the original Jack's memories of Julia survived to resurface in his clones, but it seems reasonable that it might be related to the powerful emotions that are associated with those memories, in this case his love for his wife. Sally and Victoria would also feature significantly in the original Jack's memories, but without the same emotional investment, those memories failed to make the transfer into his clones.

Tailkinker ★

Answer: They would obviously notice that the Tet was gone and would no doubt have questions, but, without outside intervention, would be unlikely to be able to do anything about it, as they would have no reason not to believe that the "radiation zones" confining them to their particular area weren't real. Some would likely die fighting Scavenger groups in their areas (without the drones, they'd be increasingly vulnerable), others might be successfully contacted by those groups and thus could join with them, some may have ultimately starved without resupply from the Tet. The film only covers what happens to Jacks 49 and 52; the others likely met with a variety of different fates.

Tailkinker ★