What I find strange about Casule's claim is his insistence that Burushaski is a modern form of Phrygian, which he implies is somehow associated with the Hellenic Bactrian civilization. He gives an example which he compares with Greek uranos --but which easily could be compared with Sanskrit varuna, etc. I know virtually nothing about Phrygian but I'd look first at local Indo-Iranian and even Tokharian before I'd consider Phrygian. Do we even have any archeological evidence of Phrygians in that area?