I'm interested in this too. As I understand, type is a way to unlock the function stack. So anyone with an x would not have a clear function stack at all and would not really be typed. One variable can change the function stack dramatically, so for example, my wife types as INTP and I think this fairly accurately describes her personality, but she claims to be a slightly split J/P. Yet, there is a considerable difference in the function stacks of an INTP and an INTJ. I wonder to what extent this is an artifact of the online tests—that is, they should be used as a means to aid typing, but not as a substitute for more lengthy thought on one's type and ultimately not as a way to dictate your type.