Well I just gave u technological inventions in my first post LOL read it again. Culturally I can say that Samarkand was the main link between on the silk road. In addition it was a huge city which was quite well developed until mongols burned it down xDI am not saying the Khazars or anyone in the central Asia shouldn't be in, just that "In my world map scenario no one starts here" is not a very good argument for a civ to be included. Saying they were culturally important, controlled large amounts of land or made technological improvement are reasons for Civs to be included.
P.S.
I was talking about KhazakhsKhazars