Turkey has only few TSK soldiers... and give support as IFV, ammo, rifles... . But in General, The army made of FSA look alike fighters in N syria, is unskilled. They are too weak to advance fast enough against enemy tactics ( like what happened in Manbij, with YPG handing over the West to ASSad). That army are not made of 100% well trained fighters, like the Turkish Army. Her future is not well...
They don't need to move against enemy tactics. They only need to come back to Turkey, go to east or west and attack unprotected territory. If needed Turkey would increase its solider.
We have 900 km border with YPG....we can attack then anyhere, not need to attack territory which is prepared to defence against us. US and Russia will do nothing against that.