Burl writes about the fellas employed in the removal of three of the four stones within the Mayburgh Henge. "One of the men employed in the work having hanged himself, and the other turning lunatic".
And the reverse must also apply.
But are you suggesting that Mayburgh Henge formerly contained a Four-Poster stone circle ? Have you seen this ( http://www.themodernantiquarian.com/site/5693 ) ?