For example the fact that the dead guy had teeth indicates non-Britannic (and non-West Virginia) origin. The gold earrings also might indicate the guy was gay. But the archeo-psychology is equally important. To prove he was Swiss, one would have to establish that he had a large numbered bank account and absolutely no sense of humor.
Stonehenge is also important in the history of MArketing. There are other Stonehenge-type sites all-over Europe (apparently the Italians just noticed they have one that is huge on a remote mountaintop plateau in Southern Italy). However, the Stonehenge gets all the PR and 94.8% of all the tourists, and 100% of the tattoo druid kooks.