The SDF, the umbrella group dominated by the Kurdish YPG, has reported on Monday that they are openly studying the possibility of sending reinforcements into the Afrin District of northern Syria, aiming to support the defense of the district.
Over the weekend, Turkey attacked the Afrin District, which is the western-most Kurdish-held district in Syria. Turkish officials have suggested that this is just the start of a broader invasion of the Syrian Kurdistan.
Having talked up the invasion well in advance, Turkey gave the YPG time to mobilize a lot of defenses in Afrin. Still, the invasion by Turkey, and some 25,000 Turkish-backed rebels may have them deciding that they need reinforcements.
This is especially true because Kurdish officials say they intend to launch a substantial counterattack against Turkey, and the SDF may decide they want to commit those forces to the battle sooner rather than later.
Much of Afrin is mountain fighting; not exactly the best place for cramming ever more combatants, especially the for the side without an air force.
The SDF is likely just talking and has little manpower to spare what with the IS still on the Euphrates and pressure from Turkey on Manbij.
The population of Afrin swelled from 400 000 to about a million fleeing war in other parts of the country. Bodies to fight shouldn’t be a problem as long as they have the arms.