So who had kidnapped Richard Engel? The very moderate Syrian FSA rebels that he has been championing

"Some observers had indicated skepticism early on about the identity of Engel's captors. The same day Engel surfaced from captivity, California State University professor As'ad AbuKhalil, who blogs at a site called the Angry Arab News Service, expressed doubts that the captors were pro-Assad agents linked to the Iranian government and Hezbollah. "