Doesn't he want to be the head of the caliphate?
He worked “underground” in the Turkish political system and came out gradually as a Islamist sort of like Chavez using democratic means to bring a communist system to Venezuela.
The notion that just because of NATO such a man (who promoted the subversion of Egypt when the Muslim Brotherhood ran it for awhile because of the “Arab Spring” and has waged a deadly campaign including terrorism against Kurds in his own country and neighboring ones) is an ally of the United States just doesn’t hold water.