What are you even talking about? The Ottomans forced their way to the Balkans,they conquered. The Serbs were paying tribute to them,so they were dragged to wars against other Christians,because that was their obligation as vassals to the Sultan. Then we have the Battle at Kosovo in 1389,then we have the complete conquest of Serbia,Bulgaria and the almost all of mainland Greece.
You called the Byzantine Empire "despotic" earlier. Tell me,weren't the Arab and Turkish Sultanates and Emirates despotic?
Stop saying silly things man. Ajde,ajde.