A different viewpoint:
Aboud Dandachi is an activist from the Syrian city of Homs, currently residing in Istanbul. He has been cited on issues relating to the Syrian conflict in the BBC, NPR, LA Times, the Guardian, Al-Arabiya and Turkiye Gazetesi.
Certainly bitter about ISIS and commends Kurdish capabilities to expel ISIS from urban areas. Also refers to the curious "hands off" stance by Assad's regime. Judge for yourself:http://adandachi.com/istanbul/isis-mosul-raqqa/