Borlase thought the Cheesewring had been built by the Druids, but I know nothing about them ever meeting there.
As for the stone..the one taken to the Grt Exhibition was a Ionic column so could not be misstaken for a menhir. There are plenty of stones lying on the moor that could be misstaken for menhirs..we need a picture I think!
Don't think that because there are so many just lying around they would not take a real one....some of the stones that make up the Hurlers are not original.
Mr H