If the Zetas had advanced communication and telepathy...it still makes no sense. The Zetas that "talk" through Nancy are light-years away. Since they have had no physical contact, I would state that communication is impossible at that level.

Even in sci-fi, telepaths must have some sort of contact with the reciever (visual, touch, familiarity). That way the sender and reciever are on the same wavelength, so to speak. I've heard no such thing from Nancy, only that she volunteered herself to a brain transplant. Oh joy.