This recent theory/discovery in medieval genealogy is exciting. Alexander II of Scotland was not one of known ancestors before and the latest Scottish monarch for me. I descend many times over from Alexander's father, William "The Lion." I also descend from a sister of King John of Scotland (John Baliol), but that's only an uncle relationship. And there's no loss in the old theory, since I descend from the disproved couple many times in other lines. Win-win!