This has become a tiered war in Syria as you know. Saudi’ and Iran are the ones sending in Jihadists and terrorists by the truckload....as mentioned before..in doing so it gets them out of their domain and occupied rather than hijack any protest in their own country.. Saudi wants Assad out...Iran wants him in... they both want control of Syria with their own people in that governance... SAudi does not want to loose it's position in the ME and they know Iran is looking for it's own brand of Caliphat...
When the Saudis say “Jump” we say “How High?” Been that way since Bush the First was in office.