well actually there is some info on the newar connection besides dr thundy s article abook on history of nepal by messrs bajracharya and co there is also a book the todas by w h r rivers which connects todas to nairs and nambuthiris there is also a book a short history of kerala in which the author k v k ayyar connects nairs to the arrathas and bahlikas of the era of the mahabharatha so some literary evidence exists and that aratta theory gives a lot of support to the scythian origin theory because the arratas were possibly a saka tribe