I argue that Rodman is better than any politician because the leadership of NK needs to keep up the appearance of defiance to the West, which means plugging their ears whenever a politician tries to talk about peace. In contrast, Rodman slips past those defenses because he's not there officially. Being a former basketball star, with a 28 year old known sports fan, he's in a very powerful position of influence compared to Western politicians. Not that he's talking politics or anything, but just being open and friendly with the kid has a reasonable chance of making him less hostile to the West.
I'm making this argument based on a proven concept of persuasion. If you ever give a public speech asserting an argument or cause, tell the audience beforehand, "I'm going to give you information that will change you mind." The audience will instantly close their ears and you will persuade no one. However, give no such indication and offer your argument more indirectly, and you will be more effective by orders of magnitude.