Those who are extremely extroverted or extremely introverted could be prone to either avoiding the opposite function altogether. For example, an introvert with primary T/F frightened to interact with the environment (possibly because of extreme introversion) might end up trying to avoid the environment input altogether and just develop the weaker introverted perceptive function instead of their normal extroverted one.
(That was one possibility. And I was imagining some other potential "ideas" to test as well, if you can take things from there...)
They are just possibilities, though, and need support from data.