When confronted with the fact that there is no relevant moderate rebel faction going by the name of „Free Syrian Army“, still some people disagree pointing to the so called „Southern Front“ as a supposed success model of a secular/liberal force fighting against the Syrian government.

The more interesting then to zoom deeper into the Southern Front:

„The simultaneous claims of success indicate that the Southern Front’s fighters likely participated in the battle alongside the jihadists, even though the FSA’s southern alliance has repeatedly rejected cooperation with Al Nusrah.“
…
„Just days after Al Reis’ [Southern Front commander] public rejection of any cooperation with al Qaeda’s arm in Syria, Ahrar al Sham, Al Nusrah and their allies in the region announced the creation of a southern wing of Jaysh al Fateh (“Army of Conquest”).“
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„Some FSA groups rejected cooperation with “Jaysh al Fateh in the South,” but others reportedly joined it. Adding to the battlefield confusion, the Southern Front apparently fought alongside Ahrar al Sham just days before publicly rejecting any collaboration with Al Nusrah (Ahrar’s closest ally in Syria)“
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„According to a recent account, FSA groups operating under its umbrella are peeling off and joining Ahrar al Sham.“
http://www.longwarjournal.org/archives/2015/10/al-nusrah-front-free-syrian-army-battle-assad-regime-for-un-hill-in-southern-syria.php

So much about the Southern Front being a reliable „moderate“ rebel faction and so much about it´s leaders credibility when they claim they will not cooperate with Jabhat al Nusra, Al Qaedas Syrian branch.