ISIS was always a fake organization composed of the Iraqi special forces, a few mercenaries and contractors, and Western intelligence agencies. Only two photos of their supposed leader exists. Osama bin Laden was dead since 2003 but they made a fake Osama bin Laden to use to manipulate the terrorists into getting caught, then when he served his purpose they gave fake Osama a fake assassination and replaced that boogeyman with the new fake Baghdadi.
ISIS had two purposes: Legally purge all the violent anti-democracy assholes in Iraq, and have a controlled fake civil war by which to rejuvenate the Iraqi spirit. They didn't appreciate their freedom because Americans gave it to them and they didn't fight for it themselves. So Western intel agencies created ISIS as controlled opposition, leaving $500 million just lying around, letting all the most violent jerks escape from the prisons, then roamed around the country creating havoc to make radical Islam look even worse and incidentally opening up Syria to invasion from a different controlled force, and then after mustering up another fighting force of Iraqis ISIS just rolled over and loses.
Remember, This is the same ISIS that was so scary that Iraqi army supposedly just threw down their guns and ran away from. Now this same ISIS just rolls over and gets wrecked by the same shitty Iraqi army as soon as Obama admin leaves office and the West gives up on trying to remove Assad. Please. The whole thing was a constructed symphony of destruction to manipulate history to cull violent individuals from the gene pools of several countries while conditioning a population to accept democracy, which as we know means "rule by secular media owned by billionaires".
