Note that #YPG use their sunni mercenary unit #JaTh to hide their landgrab Intentions.

Shekh Miskin: a strangely behaving allegedly assadist target is hit.
https://youtu.be/QSq_Bd4-6wo

ISW ‏@TheStudyofWar · 31 Dec 2015
How the battle against the Islamic State is redrawing the map of the Middle East. @LizSly
http://wpo.st/GnA01

Leader of (Kurdish) PYD-dominated Syrian Democratic Forces admits coordinating with the Assad regime.
http://bit.ly/1OzjPu2 #Syria

It is amazing that the US has for years not paid much attention to videos being released by the various Salafist groups---

Strangely neglected, this video released on January 23 2007 is the family photo of the newborn Islamic State of Iraq

You can see the brigades celebrating the establishment of the Islamic State – here a commander in Baghdad (Jan 2007)