simulatedworld's own theory. One of several JCF theories floating around. This isn't just a random tidbit of data, this is actually meaningful. (I hope it will be clear later as to why)
Now to analyse this specific one just a little bit; How does exactly Si carry over from the ISTJ to the SLI? Elaborate?
I'm going to randomly pick a part from the ISTJ analysis: "They won't stop until the quota is met, the deadline satisfied, the standards upheld. All of this ties directly back into Si's desire for stability: Te represents a universal set of logical standards and evaluations from which no one is exempt. Nobody gets exceptions to the rules, because the rules represent the lifeblood of the system under which all interactions with others are governed: if we can't count on the rules to be enforced uniformly and consistently, we can't count on anything"
Sounds familiar? It's LSI's Ti lead function all over (with Se creative). Simulatedworld just explains it by combining his definitions of Si and Te together.
And that there, is a great example of how the exact same phenomenon can be classified differently under a different system.
As for your explanation about Ne, Te, whatever, do recognize that these are concepts built up from elements. If broken down to their elements, including consideration of other elements (I do step outside MBTI and Socionics here for other frameworks), it can be seen that these concepts are not necessarily the only one way to explain the phenomenon and that the function concepts with similar names in two (or more) different systems are actually different ones, at least partially, and this introduces logical inconsistencies.