Weird things of the Syrian Civil War

When you start to follow closely the development of the so-called "Syrian civil war" you start to notice some weird things. Today, in this little text, i will talk about one thing i am noticing since the breaking of Deir Ezzor Siege and the following Kurd offensive against ISIS.
The US-backed SDF launched an offensive against IS territory on Syria on the wake of the SAA offensive, advancing without much IS resistance and without much fight over a good portion of terrain, at the same time, the SAA had to fight a bloody long battle to reach Deir-Ezzor and to cross the Euphrates river, and now is facing several IS counter offensives on the whole front-line, while the SDF rests without real fighting going for them, why?
And here is the interesting point, why the SDF dont suffer the same big IS counteroffesives the SAA suffers, is it because SAA hold land west of the Euphrates? maybe, but the SDF is holding nice oil wells and is menacing some more, and might push IS out of Syria, so surely it's a danger also, so it is a curious thing of why IS dont Really act against the Kurds.
This peculiar situation show us that there is some dark agreements behind the scenes, IS is not attacking the SDF probably by globalist orders, so it can help form a Kurdistan, which will just be a way to weaken the nations on the region and give space to more USA bases on the middle east, and of course, more Oil.
The only good outcome of this war is a Syrian Goverment victory, which will ensure the Christians in Syria safety and destroy the plans of the globalists in the area.