Someone needs to change the title of this thread.
I guess now we know who the scariest member is, hm?
It's not a complicated system. But a totally literal interpretation of it doesn't really reflect reality, especially function order. You know that.
You can only take it so far and take it so seriously, until it's just fail.
Apparently it's more complicated than you think, or you wouldn't so grossly misunderstand it. You stated earlier in this thread that your conclusions "go against cognitive functions
(or at least the order of them)", which is very telling. Forget MBTI for a moment. ISFP means, "Uses Fi, Se, Ni and Te in some order that involves Fi being the dominant." That's ALL it means. Anything else you think it means is an erroneous assumption based on MBTI's misleading oversimplifications.
The hypothetical balanced ISFP mold places them in that particular order, but there's no guarantee that real people will prioritize them that way. This is why we have personality disorders--and why Victor describes himself as so extremely introverted. He's an Fi+Ni ISFP, and his extreme introversion comes from his poorly developed use of Se.
If you're stuck on dogmatic loyalty to MBTI, which neglects functions almost entirely and states that each letter necessarily indicates that that function is used more often than its opposite, then I can see how you'd arrive at the conclusion that you did. Unfortunately MBTI doesn't tell the whole story.
So yes, an S type can use his N function more than his S function. "ISFP" doesn't mean "Uses S and F more often than other functions"; once you get out of the kiddie pool it designates a combination of four preferred functions,
but not the order in which they are prioritized (after the dominant.)
So in summary, if someone is ISFP, that person:
--Uses Fi over Fe
--Uses Se over Si
--Uses Ni over Ne
--Uses Te over Ti
--Is influenced by Fi more than any other function.