In this article 'Middle East Time Bomb: The Real Aim of ISIS Is to Replace the Saud Family as the New Emirs of Arabia', his second (the first is Post 34) Alistair Crooke he starts with:
SIS is indeed a veritable time bomb inserted into the heart of the Middle East. But its destructive power is not as commonly understood. It is not with the "March of the Beheaders"; it is not with the killings; the seizure of towns and villages; the harshest of "justice" -- terrible though they are -- that its true explosive power lies. It is yet more potent than its exponential pull on young Muslims, its huge arsenal of weapons and its hundreds of millions of dollars.

Its real potential for destruction lies elsewhere -- in the implosion of Saudi Arabia as a foundation stone of the modern Middle East. We should understand that there is really almost nothing that the West can now do about it but sit and watch.
Link:http://www.huffingtonpost.com/alasta...b_5748744.html

No wonder Iran and the Kingdom are talking.

We know there are a number of deserters from the Saudi military to ISIS; IIRC on the separate Saudi thread: