Supposedly the guys who were supposed to just kidnap Stevens were replaced by jihadis who caught wind of the plan.
The idea was to say that Stevens was kidnapped as a result of the video.
This theory gets more complicated by the day.
I don’t buy it. If kidnapping & trade was the goal, they could have kidnapped any two Americans (& a couple of Libyans) at the consulate - didn’t have to be a guarded ambassador - (no matter how poorly guarded he was, he had better protection than staff). Trading 2 U.S. embassy workers for Abdel-Rahman would have been sufficient, if that was the goal.