Funnily enough, the martial arts you're all referring to (with the exception actually being karate) are NOT karate. In fact, in Tang Soo Do and Taek Won Do, the styles aren't even from the same country (and thus, are very different). Sorry to burst all your bubbles, but you can't really compare two different martial arts in terms of grades (such as Kenjutsu can't be compared to Judo, or Thai Boxing to Bojutsu).