A multi-ethnic secularist alliance led by the Kurds has captured nearly all of Manbij. This means PISSI has been cut off from Turkey, and can't get supplies or recruits from there.

The Kurds and most of the other groups in this alliance are minority groups in Syria. The next challenge for this alliance is to recruit a lot more supporters; to grow large, it would have to recruit mostly Arabs. Can the group grow that way while remaining secularist? That would be a great development for Syria.