You guys do know that Jung never actually ordered the functions to correlate them with MBTI? He couldn't have; MBTI was developed long after Jung's death and the two systems don't really correlate that well. There are some common threads, but mostly MBTI just borrows Jung's terminology and assigns it significantly different meanings.
This explain why thechosenone, a clear ISTP, can't decide between ISTP and ISTJ--he's listening to Jung too much and MBTI too little. It's confusing for all Introverts because, when we mix these two systems that are only semi-compatible, IxxPs lead with a judging function (T/F) and IxxJs, with a perceiving one (S/N.) That doesn't make a lot of sense and it leads to a lot of weird problems.
Socionics accounts for this discrepancy; if you're an ISTP by MBTI standards, socionics most likely calls you an ISTj, because you lead with a so-called "rational" function (Ti.)
But still, you guys are putting waaaaay too much stock in the Jungian functions and running into a lot of problems because you try to correlate them so closely with MBTI.
Quite frankly, your MBTI type can be answered in four questions.