That is precisely what I believe is being covered up. There was a pre-arranged plot -- hatched by Morsi and Obama -- to kidnap the Ambassador then, on the eve of the election, exchange him for the Blind Sheikh. Both Morsi and Obama expected to win political points from the exercise.
This theory explains why Stevens was sent to Benghazi in the first place. And why he was methodically denied the security he requested. And why Tyrone Woods and Glen Doherty had to disobey orders in order to mount a resistance to the attack -- which was supposed to be unresisted. Which also explains why Obama made no move to counter the attack -- it was supposed to be successful.
But, in the ensuing violence, Stevens lost his life -- thereby eliminating the objective of the exercise. Once Stevens was confirmed dead, Clinton and Obama were left to formulate a cover story.
The trade for the Blind Sheik certainly makes sense but does not explain why 30+ CIA weapons experts were at the Annex.
I remain convinced Benghazi was a gun-running op to arm al-queda terrorists in Syria.
It would explain why obamatollah has silenced most of the 30+ witnesses to keep the gun-running op under the radar.
...the gunrunning, which I believe happened, is a crime but very minor (ie: Iran-Contra) compared to kidnapping..
IMHO they will give up the gunrunning if they have to, to keep "deep cover" on the kidnapping plot...
Again....all of this is just speculation...but it does have a thread of logic running thru it