Well, may be or not . But let us think about the parallels GMB drew about the sceene in one of his novels . There is a victim . His eyes looked up "into" the heaven . . or into the eyes of his "murder" . ... or praying . down to his knees . ??? There is the "butcher", obviously trained to slaughter a sheep or bull . Why should such a guy need two "hits" or "blows" . to kill a man? Because of the fact, that the "sheep" looks up to the sky, the "bull" into his eyes or the "innocent" down to the ground . ??? ... and taking all that into acount there are some "three over three over two over two over two" (sorry, I don't know the proper English formular) possibilities about the fact where the marks could be and what they should look alike like that actually found on the skull. Despite all the other facts . the date of starting the building of St Magnus, the position where the "bones" were placed, the way how they where inshrined . ??? Despite all that, I (personally spoken) think, it's better to believe than to know .