I think the skeletons are both of unconnectables and regular connectables. The lemon cult seems to have survived because of time shenanigans. They were connectables, which is the reason why they are kinda stupid, since they have no memory because they saved their memories in the "G-cloud".
Some connectables seem to have their mind saved in ANNET, like the dead guy that sells cars. The bombadment of ANNET didn't turn her properly off, as Engie had expected.