Turkey has no intent of doing anything we would approve of in Syria. They want Assad gone more than they want ISIL defeated. Not that I wouldn't mind seeing Assad soaking into the desert their priorities are not ours.
The reason for their timing and their route of travel was intended to imitate the Kurds and remind them of what could be coming their way at any minute. Otherwise they wouldn't have paraded 100 tanks that have been stationed on the border for months through Kobani. They could have done this months ago, the fact that they did it now with no intent of impacting the outcome of the ISIL / Kurdish fighting shows they are following their own agenda and don't want to see any winners that don't help rebuild the Ottoman Empire. Things like Assad and Kurdistan don't fit into those plans.
The reason for their timing and their route of travel was intended to imitate the Kurds and remind them of what could be coming their way at any minute. Otherwise they wouldn't have paraded 100 tanks that have been stationed on the border for months through Kobani. They could have done this months ago, the fact that they did it now with no intent of impacting the outcome of the ISIL / Kurdish fighting shows they are following their own agenda and don't want to see any winners that don't help rebuild the Ottoman Empire. Things like Assad and Kurdistan don't fit into those plans.