I find the fact that Merlin was so involved in the naming of Arthur as heir to the throne very interesting. Yes, the prophecy was fulfilled, but it was indeed Merlin that set the sword in the stone and promised that "...whosoever pulls the sword...etc." The barons and lords competing for the throne were upset with Arthur's success, but they did continue to trust Merlin's test, even if they delayed in accepting Arthur. Did Merlin's choice for king simply outweigh their own judgements, or is this simply a part of the tale?