I think i figured out why some people use different functions.
Te/fi user swallow foods and drinks by not pushing their tongues against their palate but by using different a different swallowing patter which involves using facial muscles.They even might chew using their facial muscles which over time leads to using these muscles in talking and so forth.
Fe/ti users use correct swallowing form which is pushing the food or drinks on the roof of their mouths to their throat bu using just their tongues and no to minor facial muscles use.A wider palate would help with this which is why asians and blacks in particular usually are fe/ti users.
on the other hand i think ne/si users have bad neck posture and low occitopals and se ni users are the opposite.If you are a ne/si user in ct try to push your chin back into your neck by tucking it..you will notice you will get a double chin. The more the better. i usually get a triple chin since i weigh alot. Now look in the mirror with your chin tucked and you will notice your eyes have just turned se/ni. Try to scowl and it will be an ni scowl. try to move your heads sideways and notice the difference
ill expand on this post another time but i am i a rush to go to a party