I have a theory that people with an underdeveloped / unhealthy leading function appear similar to their supervisees. This is based on a couple people I know (I didn't just pull it out of my ass), and I'm curious whether it meshes with your experience.
If the development of the leading function runs up against obstacles, the individual will retain acute sensitivity to that particular information aspect without developing the corresponding confidence / ease of active use. Therefore, on a superficial level, the individual's use of this function might appear similar to an exaggerated PoLR, and the person in question will fall back on their creative function. Eg:
An LII is sensitive to the logical structure of things but becomes hypersensitive to their own perceived ability to generate logically consistent and structurally sound ideas -- so they fall back on Ne, and their pronounced sensitivity to combined with their insecurity in Ti makes them look like IEEs with exaggerated PoLRs.
An EIE remains very sensitive to Fe, but their confidence in their ability to actively "manipulate" / "create" / "influence" Fe aspects of reality is impaired. So until they're able to realize their leading function, they fall back on Ni and have a prominent insecurity in all things Fe-related, so they come across as a fucked up ILI.
Same thing works for any type -- theoretically. Does this line up with your experience?
If it's true, it makes typing significantly harder because it contradicts the idea of behavioral typing. Then again, behavioral typing is probably a dead-end anyway because if we see socionics as just a way of modeling behavior instead of a method for understanding how people tick underneath the surface, then it becomes pointless, irrelevant, and tautological.