It would not surprise me that Erdogan, most likely the real ISIS backer as evidenced by fuel and weapons smugglin routed prior to the coalition putting a stop to that; will integrate the Idlib fighters into Euphrates shield forces and hit Manbij from both sides. I guess they are waiting for the coaliation to 'finish off' Isis near the Iraq border which looks like it may happen ST, after which both Erdogan, Putin, Assad, Iran etc will call on the US to exit before hammer down on the Kurdish areas?
Trump is obviously keen to pull out for good reason... the place is a quagmire and Putin is welcome to it.