What does the death of Fethullah Gulen mean for Turkey?

Fethullah Gulen, the Sunni Muslim Cleric who was accused of engineering the failed coup to overthrow Turkish President Recep Tayyip Erdogan, has died in self imposed exile in the United States. Once feted as a moderate who steered generations of young Muslims away from radicalism, Gulen did untold harm to Turkey's fragile democracy, says Turkish analyst Selim Koru.