I can't quite get my head around the fact that if the hills were that important, they'd have made it a bit more obvious by not just pointing the shaped side of one stone at the hills. . they'd have pointed the the whole bleedin' thing at the hills?
But as I said, I've no better theories, and when I was there, I spent an awfull lot of time looking at the hills, and Summer Garland had her photo took standing in 'the spot'.
Can you like and enjoy a theory without believing it 100%? I think so.