this
Sarmatians/Scythian were large group like the Huns. The Huns had multiple language skill because of mercs or something.
Maybe Sarmatians and Scythians were Iranic speaking or multiple languages, but due to location and movement were more light skinned.
Is it not possible that after Huns/Mongols/Turks invaded they got some input from Scythians/Slavs/etc, explaining the z93?
Map of Indo Europeans 500bc
https://s33.postimg.cc/rsbcmra8f/Ind...0_BC_-_map.jpg