Let us assume that this is correct, why would al Queda do something which would destroy this pipeline? This is what collapses this theory for me.
Now it does appear to me to be true that someone wanted Stevens dead for some reason.
1- requests for more security were declined;
2- security on the spot was actually REDUCED;
3- armed drones patrolling Libyan chemical weapons depots were withdrawn from their normal 24-7 actions;
4- there had been two prior terror attacks on the compound;
5- after an unsuccessful assassination attempt the British Ambassador was withdrawn from Benghazi;
6- security evaluation was screaming for more;
7- Stevens was sent into this cesspool without a chance.
When the ex-SEALS decided to act against the chain of command things got derailed.
Either the idea was to set up a kidnap-release scenario or creating a Gay Hero Martyr either for the benefit of The Disaster’s Campaign. This was about the only way they could win.
And just so you know, personally believe that Osama Bin Laden was already dead when they raided his home (kidney/liver failure). They killed a stooge, otherwise his wife would have died trying to protect him. So I believe some deal was made with Al Qeada. Let Obama appear as if he killed Osama, and they would get something in return. Like for example, all the weapons they need in Syria.
So I am willing to believe the Stevens was an insider job gone wrong theory, but we need the motives and facts to match the theory.