Saudi is throwing returning ISIS volunteers in jail and people like al-Maqdisi and al-Odeh have heaped criticism upon ISIS for being an illegitimate caliphate and violating the obligation to obey 'ulu al 'amr
I've read plenty of cables. I remember them bitching about Syria and listening to Saudi but I can't recall besides maybe giving some sort of ambitious April Glaspie type green light to Saudi Arabia (to support ISIS) anything like what the poster above is saying about ISIS.
The US very publicly supported the FSA, and while under the advisement and training of the CIA, the FSA fizzled out and most anti-Assad fighters left and joined Daesh or al Nusra.