From the article.
Ansar Al Sharia, according to Saudi intelligence, is backed, funded and directed by Iran. They are enemies of the Saudis and are trained by Iran’s Quods forces.
Who else was in Benghazi? A faction of AQIM Al-Qaeda in the Islamic Maghreb backed by Syria. Syria, like Iran was in Benghazi. What was going on in Syria? There was gunrunning and arms smuggling from Libya through Turkey, Lebanon and Jordan into Syria as well as bringing in fighters to engage in a war with Syrian President Assad—the backdoor to Iran.
Two different groups fighting each other in Bengazhi. The Benghazi attack was inevitable given the circumstances and it was the opening salvos in WWIII.