Trying to figure out where Homeland is heading in Season 1

Spoilers here: but about 8 episodes into the excellent Showtime series "Homeland" (Season 1) I'm completely convinced that my surmise in previous post is on the money: Estes, the CIA boss, is clearly the mole within the CIA, giving away information to Abu Nazir and the terrorists: he has the means and the motive; they made it really clear that he's in a terrible divorce situation and he needs the money. If you closely watch the interrogation scene, he had the opportunity to slip the terrorist subject a razor blade. He was completely uncooperative on the lie-detector test, and they didn't call him on it because of his rank. He's tried to hinder Kerrie (the excellent Claire Danes) except when he can use her, and he knew of all the intelligence info and had time to convey it. OK, so maybe I figured that much out; but what about Brody himself, the returned POW whom Kerrie suspects has turned? We do know that he has been working with the terrorist Nazir - but is he some kind of double-agent or triple-agent? In these latest episodes they dramatize how and why he supposedly "turned" - anger about the American drone bombing, and then the cover-up, that killed Nazir's son, whom Brody was tutoring in English. I wonder, though, if the bombing could have been done or staged by the terrorists: we know they faked the death of an Marine in order to get Brody to believe his was guilty of murder. My first thought was of the Muslim interpretation of the Abraham-Isaac story: Abraham would have and did kill his son, in service to the cause. But I'm actually thinking that maybe Nazir never had a son, that the whole tutoring arrangement was plotted out to ensnare Brody: the kid may have been just a street urchin. Very hard to figure out Brody's motives and objectives. Also hard to figure out how his fellow POW survived or why he's turned into terrorist himself.