[The horizon of the Avesta] “is according to Burrow, wholly eastern and therefore certainly earlier than the westward migrations of the Iranian tribe… - Gherardo Gnoli

[the attempt to transpose the geography of the Avesta from Afghanistan to western Iran] “was doubtless due to different attempts made by the most powerful religious centres of western Iran and the influential order of the Magi to appropriate the traditions of Zoroastrianism that had flourished in the eastern territories of the plateau in far-off times. Without a doubt, the identification of Raya with Adurbadagan, more or less parallel with its identification with Ray, should be fitted into the vaster picture of the late location of Airyana Vaejah in Adarbayjan.” ...

Having done away with the obstacle provided by the theory of the trans-Caucasian migration..., we can see both these peoples as western branches of those same Airyas that in the Younger Avesta are described as being settled in such a large part of the eastern Iranian world....

Now, the obstacle that arises from the theory of the Medes and the Persians having emigrated from the North ... on the basis of a highly conjectural interpretation of the archaeological evidence, is now removed by the archaeologists themselves. A body of evidence... orients us in quite a different direction, namely towards that of a migratory movement, probably a slow, progressive one, from East to West, along the great Khorasan Road.....