It appears that Ba'ath loyalists are playing as important role as the Islamists.
Of course. The way Malaki has treated them, I don't blame them too much for thinking that ISIL is the lesser of the two evils. I don't know why Kerry stopped over there just to have a meaningless photo-op. It is impossible for there to be a unity government with Malaki involved. The Sunnis would never believe Malaki would not revert to form once the crisis was over. There will be no chance of a unity government until Malaki is out of power, either because of a coup, or because the insurgents take Baghdad. (Which I doubt will happen.)