That’s the one!
In that picture, the “rebel leader” would be General Idris of the secular (it includes Christians and Allawites) Free Syrian Army (FSA) which has been at war with ISIS for 2 years and has killed more Islamists than the Kurds have.
But of course this doesn’t serve the cause of reductionist politics where ‘they’re all the same’. Short of biologically wiping out the entire population of Islam you’re going to have to deal with Muslims and Arabs. Might as well start learning the good from the bad.