Like you said, it was just "heat and air", and that's pretty vague to be able to track them down. It could be enough, I suppose. But then when why send Walsh to find the missing employee? How did she know? It's possible she looked it all up on the computer, but again that seems to be more of a stretch.
They did make a point of showing her accessing some files on one of their computers, though. Personnel records could easily have been among them. The curious part is that Weaver thought there was one missing employee - but there actually are 2. Which one was Walsh looking for? Zoe's father or Winston? I suspect Zoe's father.
While it is not impossible, it would also be drastic for Weaver to shut down her own operation like that, if it was hers. In the intercepted message, they were referring to an evacuation and "you know the drill", so procedures in case of a security breach were in place. Even if Weaver simply does not tolerate sloppyness (the unsecured line), wouldn't killing the persons directly responsible have worked?
I doubt it too, but not for story reasons. Carter is basically a forgotten element, even though he should've easily been able to escape that facility. I'm almost certain that Weaver wasn't really thought of at that point.
The last point is very likely true. But whether Carter is forgotten, remains to be seen. On the producer's blog, the return of at least one S1 character -
previously unseen in S2, so not Charlie - has been announced. There aren't that many candidates; Carter is one of them (I guess Cheri, Morris, Terissa Dyson, Dr. Silberman are the most prominent of the others). So, maybe "he'll be back".
I think it would be interesting too, but it just isn't written that way so far. If they change it, it will just seem like change for the sake of change rather than making sense.
I disagree here. Weaver's character is rather ambiguous now. She kills easily, true, but Cameron is almost as quick to kill. The most curious thing about Weaver is why she would possibly want JH to learn "morals", and she does seem to spend a wee bit more effort on Savannah than strictly necessary for her cover. At the moment, we don't know what Weaver's exact goal is, but she doesn't act the way Carter did. Her "crossing against the light" comments early on were also interesting.
That does not have to mean she is pro-human in any way, but what if she was send back by a Skynet that was desperate and losing the war in the future, and they may want to try another approach instead of nuking everything?
I am also not 100% sure if Ellison doesn't have at least suspicions, regarding Weaver.
They're not aware of her bombing the place at least. From the sounds of it, the employees were so secretive and kept in the dark about their job that it's likely none of them knew much about their parent company, or much less that it was possibly controlled by Zeira and Weaver.
True enough. Allthough it does seem that Winston and Zoey's dad, who were the killers in the operation, may have known more than the other employees. They did make off with the drone, in any case.