Gulenko believes (at least as far back as the 90s, so things may have changed) that if someone values +Ne, they also value -Ni at the id level, but devalue -Ne and +Ni and never use either. +Ne and -Ni complement each other energetically, so there's no friction in using them side by side and no incompatibility (as between +Ne and +Ni /or/ the classical Ne and Ni).
So an ILE's ego: +Ne -Ti would be complimented by -Ni +Te in the id (id is the level of basic survival with the strong functions you use for daily chores - he calls it vital harmonization - whereas the ego is an area of creativity and higher goals, usually; though I suppose it's possible that there exist really practically minded people of any type who use even their ego functions less abstractly).
When DCNH is discussed on his website, people don't talk about an ILE Si or Fe subtype. They talk about an ILE Ni or Te subtype. It's your strong functions that get effected, so clubs get grouped together. A way to explain that maybe by assuming they break the subtypes down for ILE like this:
+Ne-ILE, -Ti-ILE, +Te-ILE, -Ni-ILE, whereas +Ni-ILE would be too incompatible and energy intensive to ever form into a stable structure.
Gulenko's descriptions on +/-: http://www.the16types.info/vbulletin...o-gulenko.html
No clue if this is right, but it makes sense superficially at least.