The plan was replacing Assad with a Turkey friendly Sunni goverment but it didnt go as our goverment calculated.
Everything happening today, including ES, are damage control, the goverment took the threat of Kurdish separatism too lightly and now cant really do anything to prevent it.
You say we arent working with SAA but the fact that FSA retreated from Aleppo is only thanks to Turkeys negotiations with Russia, some FSA fractions are hating Turkey because of this.
Syria policy is a desaster, no need to show it as a success, what we ended up with is 3 million refugees who will continue to be a economic burden for the coming decades.