I actually have known the Wolfman since he was 19 years old, although I have not seen or rolled with him for 15 years. The last time I rolled with him, his skills were mediocre, however in the last 15 years he has trained, and has been kicked out of, some of the best gyms in the world. I imagine in the last 15 years he has improved. Dennis Hallman is a no bullshit kind of guy, so the fact that he gave Dan his black belt probably means that he is a legitimate Black Belt. Don't forget I have known Dan for 21 years and he has been training all of those years, so I do not doubt that his skills are greatly improved and he is legitimate.
Deep down inside Dan is actually a decent guy, and although I am not a Licensed mental health professional, I would imagine he has some type of undiagnosed personality disorder which he probably should seek treatment for. Although, he does bring a lot of negative attention to himself due to his shameless self promoting, people do take it too far, and are down right mean to the guy, and l am not sure if he can control some of his behavior.