[Verginius Rufus]

This theory doesn't seem to be getting much traction. If you look at the English-language Wikipedia article on Burushaski, they list Casule's writings in the bibliography, but treat the language as an "isolate" (no proven connections to any other language). One theory even has it related to some North American Indian languages (Athabaskan family). It could be related to a language spoken by 100 people in Siberia. The German-language version of the Wikipedia article is more definite: "attempt to make it an Indo-European language is not convincing."

The grammar and forms don't resemble any of the Indo-European languages I have studied. I think if it were descended from Phrygian the Indo-European features would be a lot more obvious.

[Renfield]

I did read the wikipedia entry and did come to basically the same conclusions as you did.

[G8 Diplomat]

I don’t like this Indo-European theory either. I like the hypothesis that Burushaski is Dene-Caucasian (of which Athabaskan is a part), much better.

Here’s some random info on the language:

http://www.few.vu.nl/~dick/Summaries/Languages/Burushaski.pdf