I don't think this is true, the rebels are extremely fractured and don't hold as much territory as ISIS does but they are still a major force. According
Wikipedia the FSA has between 40-50 thousand fighters, the Islamic Front has between 40-70 thousand, and there are several other smaller rebel factions. ISIS has between 31,500 to 100 thousand fighters. And according
this map, the amount of ISIS held territory that is actually populated appears to be roughly equal to the amount of rebel held territory.
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