What's exactly a loop?

Now, it is entirely possible for extreme introversion to cause one to not develop their auxiliary function in the extraverted attitude (and vice-versa). However, that doesn't mean the person will have a more developed third function than second. That's a lot like missing your flight from Chicago to New York and instead hopping on a plane going from Chicago to Paris, checking into a hotel, doing some touristy stuff, grabbing dinner, and then complaining that you need to figure out a way to get back to New York. Why wouldn't you just find another way to get to New York?

Well, it's the same way with the auxiliary. If you can't find a way to extravert your second function, you're not going to resort to the third, less conscious function, you're just going to use the second function in the preferred attitude. To reiterate what I said here:

Your auxiliary, by virtue of being the auxiliary, is the second most conscious function. If your thinking is more developed than your feeling, you aren't an INFJ, you're an INTJ. Now, early Jungians thought that the auxiliary was in the same attitude as the dominant. Even the MBTI manual allows, in the chapter on counseling, for people to develop an auxiliary that is in the same attitude as the dominant. Note on page 226:"Some Extraverts seem to use their auxiliary function as well as their dominant function in the Extraverted attitude. This makes them appear to others as 'extreme Extraverts.'" and, further down the page, "Some Introverted clients introvert both their dominant and auxiliary functions, making them appear as 'extreme introverts.'" If you're an INFJ but your introversion is extreme, then you may see more Introverted Feeling in your personality. If, however, you see neither Introverted nor Extraverted Feeling in your personality, but you do see Introverted Thinking, then you may want to examine whether INFJ is the best fit for you.

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