Well in that case I would love to see you back that up with some sources, because everything I'm reading says that the rebel forces are made up of dozens different backgrounds, like iranian kurds, the iraqi al-qaeda , the ANF, sunni muslims and even europeans.
Also heres an actual source backing my question, so fuck off.
"Since the beginning of the conflict in Syria in early 2011, we estimate that around 2,000-5,500 foreign fighters have gone to Syria to fight with opposition forces"
http://www.washingtoninstitute.org/policy-analysis/view/european-foreign-fighters-in-syria