Is there any uncertainty as to how the capstones were put into position on this type of monument, then? There should be other visible examples, in structures that may have collapsed, for instance.
Well, you two seem to be taking in your stride something which, if true, would be a very big deal. Stonehenge has no forerunners in the use of mortises and tenons does it? (Apart from thousands of wooden examples of course....) I hope our minimeet colleagues can measure the shape of both to see if they're comparable. But that will have been thought of and done, surely?