A key to understand the VMS

[-JKP-]

Basque shows that a language can be truly different from its surroundings. If isolates went extinct, a whole lot of unique linguistic information was lost.

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Yes, not just the language, but also the religion (it helps to live in the mountains where it's hard for outsiders to interfere with your customs). Pagan traditions are still strong in that area.

But even Basque has a discernible grammatical structure that can be seen quite quickly by someone who doesn't know any Basque (e.g., nuen/zuen/genuen  I/he/we). The VMS doesn't wave these kinds of flags.