Turkey supports certain Syrian rebel groups against other anti-Assad groups and fighting the Kurds more than anyone else in Syria. Turkey allowed ISIS to flourish and pour into Syria. Turkey buying oil from ISIS-controlled oil fields. Turkey allowed Russia and Assad to attack anti-Assad groups from territories controlled by pro-Turkey Syrian elements. Brother, Turkey is looking for its interests in Syria, its not helping anyone. Saudi Arabia's humanitarian aids mainly bread, oil, sugar, flours, blankets and winter clothes are stolen and re-distributed by Turkey. This is to control the freedom of navigation of Syrian fleeing the country. The people who stole the prophet belongings from his room in Masjid Al-Nabawi and refused to bring them back are the same people who are fighting the Syrians today.
I don't agree with your assessment, Turkey's main concern is about Kurds getting to much land , Power and Weapons and we'all know What PKK has done to Turkish people, Plus if Turkey is helping a Sunni fraction against Asshead than its fine , everyone does it . Qatar , KSA and UAE for years funded Sunni fighters in the region . And lets not go what People has done to Mecca and Medina or what stole, Turkey and KSA will never see eye to eye because of many reasons , Turkey has a legitimate reason to hate Saudi's because of the Great Betrayal of Ottoman Empire, KSA and Iran Harm Islam is a way which in my opinion only Esa Pbuh will be able to fix when he return's , if he returns .
I see Turkey's Situation similar to Pakistan's in 80's and 90's , the only difference is that Turkey has a strong Economy + Army +Will to Act on their enemies , they are also face to face with a Super Power ( Russia ) , we did to ( USA ) , they have a Hostile neighbor , we did too ( Afghanistan ) and the lists goes on , For me in this conflict I support Turkey and its actions as long as they don't cross their limits and become the Aggressors , Because as per Quran, Allah don't like Aggressors .