Petraeus is part of the cover-up if you believe King's take. Petraeus said that he informed Congress three days later that it was a terrorist attack. King says no he didn't and pointed to Matt Olson's subsequent testimony that it was terrorism and the stir it created.
Petraeus said that the briefing points were changed thru an interagency process and did not consider that to be that significant at the time. Petraeus is part of the smokescreen pointing fingers elsewhere and giving excuses and outright lies for his own behavior.