You're spot on with those points. My view is slightly more positive; there should be a little of ALL those options in a really clever script.
Kerry is BOUND to feel some attraction to Brody under the circs - the question is how much, and whether it clouds her judgements.
Brody might play her, or he might fall for her*, or possibly both! None of these would tell us for sure whether he's a turrrrrrorist!
We're into proper spooks (with a small
s) territory here - people suspecting each-other, but never knowing for sure, cos the double-bluff is always on the cards, and who can they ask for a 2nd opinion?!? The Le Carré legacy
What I liked about that episode was that it appeared to be an ad-libbed tactic. She doesn't know what she's doing, and we don't know for sure their motivations. All we know is that she's desperate for a result, and
doesn't mind breaking a few rules ... (here we go again).