Never underestimate the Court Jester who both amuses and works his audience. Here the court Jester- Roland Walter Dutton dangles "Rover" at the end of a stick!
Court Jester's were the only ones who could say the things that needed to be said, to criticize the King and make political commentary and be able to get away with it. Perhaps that’s why the Prisoner asked Roland Walter Dutton as a character witness, for Dutton was better suited to say the things that needed to be said. Either that or because the Prisoner knew that Dutton was due to die, and had nothing to lose by saying the things that needed to be said. But then again neither did the Prisoner!
Be seeing you