I would argue you are overthinking it.
The Lt Col who testified before Congress said that they attacked and drove out the Brits and others and ours was the last flag standing. The attack was a certainty. The question was when.
Then there is the Major Burns effect. Like Major Frank Burns, the bureaucrats in DC followed the book in the face of common sense indicating strong out of the book action was required. There was direct testimony naming names to that effect
The Congressional testimony is the closest thing to the truth we have available.
Death and Deceit in Benghazi - Full Youtube Video
I to agree.
But this still does not answer some criticl questions and I would put nothing past this crinla gang from Chicago.