That's a trick question, given that this "genius level" IEE or SEE would be judged to be intellectually superior to such an LxE in
every way, not just in regards to Te.
In relation to the person's own psyche and personality, Te is the best function of that LxE, just as Te will never be the best function in the IEE and SEE. (Basic understanding of
Dimensionality.) In comparison to their own functional make up, the dimensionality/strength of Ne or Se of the xEE will always be superior over any Te efforts.
And may the disabled LxE be inferior to the genius IEE and SEE in regards to Te, this is not truly relevant; given that such an abnormally inferior LxE would be inferior in every other way, too. (Basically, inferior to
any normal type, actually. Not just genius people.)
All in all, I don't see a point in comparing extremes like that. It makes more sense to compare people of the same intelligence level. In that manner, an average Te lead would naturally always be better at Te than an average IEE or SEE, even if both people are intellectually on the same level. But at this point, one also has to consider how intelligence is being rated. Based on my observations, Thinking is rated as more "intellectual" in general; Thinkers are often seen as being more intelligent than Feelers in general, just based on the fact that Thinkers think rationally (logically). Intuition is also often rated as being more "intellectually superior" than Sensing. Likely because of the fact Intuitives think more abstractly, which is regarded as more "intelligent". It is no surprise NTs are universally regarded to be the most stereotypically "intelligent".
Based on that, an LIE could be judged to be "more intelligent" than an SEE, even though their true intelligence levels are the same. But that's another issue.