SPOILERS FOR AOS AND DOLLHOUSE BELOW:
1. My first prediction was that Chloe = Echo. I feel very good about this. I still think it's dead on, down to something in their blood being special. Of course it's their blood:
XANDER: Why blood? Why Dawn's blood? I mean, why couldn't it be like a, a lymph ritual?
SPIKE: 'Cause it's always got to be blood.
XANDER: We're not actually discussing dinner right now.
SPIKE: Blood is life, lackbrain. Why do you think we eat it? It's what keeps you going. Makes you warm. Makes you hard. Makes you other than dead. (quietly) Course it's her blood.
2. I thought other characters might map on to Dollhouse characters, suggesting Fitzsimmons/Topher as an example. I think I got that wrong.
3. S.H.I.E.L.D. would be morally ambiguous. I think I called that. Here it's a case of infiltration rather than something necessarily inherent in the system, but the net result is the same: the institution is corrupt.
4. There would be Foucaltian themes of societal coercion. I'd give myself half a point on this. There has definitely been mind control, deception to force others to act, and the prospect of more subtle forms of coercion from higher up in S.H.I.E.L.D. remains.