A long newspaper article to read in The Guardian, which on the first read covers many points and links on SWC. The key feature appears to be access to two Jihadist clerics, Abu Muhammed al-Maqdisi and Abu Qatada, now both resident in Jordan:http://www.theguardian.com/world/201...pled-al-qaida?

Here is a taster:
Now the man US terrorism analysts call “the most influential living jihadi theorist” has turned his ire toward Isis – and emerged, in the last year, as one of the group’s most powerful critics. ..... Maqdisi released a long tract castigating Isis as ignorant and misguided, accusing them of subverting the “Islamic project” that he has long nurtured.

As Qatada poured tea into small glass tumblers, he began reeling off images to better communicate the depth of his loathing for Isis. He likes speaking in metaphors. The group, he said, was “like a bad smell” that has polluted the radical Islamic environment. No, they were better described as a “cancerous growth” within the jihadi movement – or, he continued, like the diseased branch of a fig tree that needs to be pruned before it kills the entire organism.
Violent groups often reject their mentors IIRC. Now whether the two clerics can influence how ISIS develops is a moot point. At a minimum it may restrain those jihadists who have read their tracts not to go to join ISIS.