The most accredited hypothesis is that it is due to logistical needs (supplying the front line with ammunition). This suggests that Ankara lacks advanced Combat Service Support.
Pro-ISIS jihadists want to raise their heads by taking advantage of the Turkish Claw-Sword operation in northern Kurdistan, but SDF and Inherent Resolve had foreseen this.
Moscow doesn’t want to get involved Ankara-Kurds conflict. Meanwhile, the TAF intensifies raids against the SDF command and control centers and sources of supply.