Okay, so Sparklelord probably didn't know about the ghost, he just needed the name to not get people mad at any other famous vigilantes named Dr. McNinja.

But there's something else about this comic. He's using loophole logic as if he was bound to do what the doctor asked of him or something. Could there be a way in which Sparklelord has to serve others sometimes? How did that not come up when he was one of the knights of the radical lands? Why am I reading way too much into this comic?