As far as I am aware, the WTF is supposed to have higher standards than, say the ATA - how common is it within this org for students to receive their black belt after less than three years? Would this typically only happen if the person in question was an exceptional student?
I would go on to formally train in Taekwondo under Brad Tinnon of the U.S Taekwondo Center of Master Pyong Tuk Ko. Under Sa Bum Nim Tinnon, I learned WTF Taekwondo and was exposed to Hapkido and Tai Chi in my trainning too. Brad Tinnnon moved on to affiliation with the Action Arts Academy, and I was in his first class of testing black belts, earning my 1st Dan in WTF Taekwondo from him in a mere 2 and a half years opposed to the normal 5 to 6 years.