Rush is over thinking this. ISIS is Sunni.... and they are killing SHIA and Christians... anything not SUNNI. It's not that they are destabilizing those areas. They are purging those areas. Iran is Shia. This is as simple as the same hatfield and McCoy's that has been going on over there since 650AD. ISIS is the mussel for the Saudi's, and everyone else who is SUNNI. (80% of the region). Obammy's father was SUNNI. He is not sympathetic to the Iranians. He is partnered with the Saudi's and ISIS.
He worked the deal with Iran, because he is trying to buy ISIS safety until they can complete their mission.
Lord o' mercy. My scorecard is all screwed up. This is more convoluted than a Pirates of the Caribbean plot.