ISIS’s Secret Allies - The Daily Beast
In summary, ex-Saddamites, tribal councils, and other militants are helping ISIS but once all the fighting is over they will probably start to fight one another. So why don't we just let them destroy themselves and stay out of it? Or if we do get involved, use spy's to create tensions between the different groups involved?
Snip> Hassan, who has been observing ISIS said, It is expected that ISIS would try to impose itself, considering that it brands itself as a state and that it alone has the legitimacy to rule.
The groups propensity for imposing its will regardless of the consequences will likely lead to confrontation and clashes with other groups, he said. The offensive was planned together but that does not mean the old rivalries will not come up again. It is very likely that rivalry will lead to clashes.
War can be a centrifugal force, pulling together disparate groups who share a common enemy. Its after the heat of battle when it comes time to divvy up the spoils and work out power sharing arrangements, that yesterdays allies turn on each other.
Thats where jihadi groups have always failed in the past, said Fishman. ISIS has built a military coalition, he said at this point they havent fully demonstrated it can be a governing coalition. If this crumbles in the near term it wont be because Baghdad gets it act together but from the coalition coming apart.
http://www.thedailybeast.com/articles/2014/06/13/isis-s-secret-allies.html