My wife and her friends are all SJ's, yet having become rather "charismatic" in their beliefs, seem to have taken on some Ni-like behaviors, such as premonitions of the future, and "prophetic words". One of our friends, who seems to be ISTJ, seems to have always had this strong vision ability or "knowings", from growing up in a background of Catholicism mixed with witchcraft. (Called "brujeria" in Spanish). They even tried to make her a bruja!
They otherwise do seem more like SJ's (strong reliance on the past to learn from and need for familiarity). My wife thought she was good with Ni when I first described it to her, yet when I handed her a page of my various symbolisms of things in life (which I now recognize as my own shadowy use of it, and would have been right up the alley of an NJ), she was like "that's crazy". This would be more like a reaction to one's "trickster" process, instead of good parent, and what she "parented" with was what she learned in psychology (hence, how crazy it all sounded).
Myself NOT being Charismatic, I tend to question a lot of these so-called "gifts" (though I believe they are hypotheticaly possible. They don't seem to quite line up with the original Biblical uses they are patterned after, however).
So is this feeling of a spiritual gift (whether actually supernatural or just psychological or even outright imaginary something) able to lift the Ni process out of the depths of the shadow and make it strong, positive, trusted and effective like that?