I am developing a new theory that asserts people can ascend their base Jungian archetype. I am basing this theory on the development models present by Jung, Beebe, and others that state or imply that individuals use and therefore develop all of their cognitive functions as required.
We approach any problem with our dominant function. If it does not solve the problem, we must choose to escalate to our secondary function or drop the problem unsolved. Each time we escalate the problem we step to the next cognitive function on our archetype track. For INFJs, the track is Ni > Fe > Ti > Se > Ne > Fi > Te > Si. Each time we use any of our functions in a new way, we gain more capacity with them. However, at some point the human mind can develop the ability to 'skip' functions (as in briefly allow that function to consider before aknowledging inability) when it can identify the best suited function. For example, an INFJ with experience in relative math would likely 'skip' a few functions and go straight to Ti and Te after Ni. This would develop Ni, Ti, and Te, but would also force Fe to develop a little by creating areas in which it would bypass itself voluntarily at the direction of Ni's ability to determine the best course of action cognitively. The end result however would be a more developed Te - something outside the normal pattern for INFJs, but entirely within the paradigm of Ni seeing the pattern and jumping to the 'answer' which does not include Fe.
Life is full of situations that force INFJs to use functions other than Ni and Fe, especially in a world dominated by STJs who focus on Si and Te, giving us plenty of opportunity to develop cognitive functions outside our standard model.
If we can develop these additional functions to such a degree that we become 'fluent' with their use, we begin to ascend the standard cognitive model, because we become able to switch perspectives well enough to appear to have the cognitive model of another type in those instances. This is an adaptive trait, of course, that does not change the inherent type, but does create the illusion of it, even to the user.
It is very clear that ENFPs are the best suited to this sort of ascension as they are both Ne and Fi. Ne gives them an initial perspective of possibilities while Fi gives them an unconscious right brained adaptability. Yet, I believe ENFPs, who are noted as the greatest of the mental 'shapeshifters' (for using this very method), are only a step ahead of the rest of the intuition dominant types - INFJ, ENTP, and INTJ.
For other types, it seems that secondary intuition preference (ENTJ, ENFJ, INFP, INTP) follows the intuition dominants in the ability to ascend their type model, then intuition tertiary (ISTP, ISFP, ESTJ, ESFJ), followed lastly by the intuition inferiors (ISTJ, ISFJ, ESFP, ESTP).
In other words, it is beginning to seem like the inherent pattern recognition of the intuition functions may develop into a mental switchboard with efficiency in direct proportion to their dominance in an individual - when significantly developed, and this may explain why so many of us INFJs, ENFPs, ENTPs, and even INTJs have so much trouble deciding on our type - because we've begun to ascend our type and therefore exhibit traits of other type models.