I thought the Jung-Meyers Briggs gives you the choices of Introvert/Extrovert, Sensing/iNtuitive, Thinking/Feeling, Judging/Perceiving. Where did you get mastermind? Anyway I think it's all nonsense. I don't believe you HAVE to be one of two extremes...it should be a spectrum. I thought I was a ISTP, but when I scored the test, I turned out to be a INFJ. When I was reading the description for my results, I read the wrong one, but when I read it, I was thinking "oh yeah, that is me." But then I realized I had read the wrong one, and when I read the right one, I thought, "oh yeah, that's me too!" And then I read the one for what I originally thought I was without the test, and I thought "hey, that's me too!"
So it's like reading your horoscope, and it's all nonsense. You can totally adapt yourself and your life to whatever it says because it's so general. At this point, I think we know what type we are.
The only tests that matter to me are the ones that told me that if I were a monkey, I'd be a chimpanzee....and if I were a breed of dog, I'd be a Scottish Terrier....and if I were a star wars character, I'd be yoda!