Most likely the Syrian forces are there to participate in an attack West against Turk occupation.
With Russian air cover Syria can drive Turks and allies from Aleppo and Idlib.
Turkey could only hold a 10 or 15 mile strip near their border. Maybe Afrin too, maybe not.
Aleppo was liberated two years ago...this photo of Mufti Sheikh Mahmoud Akkam, Governor of Aleppo Hussein Diab, and Patriarch Mor Ignatius Aphrem II was taken at the Syrian Orthodox Church headquarters last week.
This is the future Syrian nationalists are hoping for in Idlib, once the foreign interventionists and their proxies are defeated.