I don't believe they are opposite. I think they exist on a spectrum.For E/I, the ability to gain energy from external stimuli and being around people is not going to be the case typically for the person who gains energy by being alone. Those are opposite states.T/F doesn't describe traits. It describes habits of mind. Are you suggesting the T/F divide is entirely arbitrary? After also suggesting that there is a characteristic "dynamic" to T/F relations? How do you account for this discrepancy?The T/F categories are might not often overlap, but there isn't anything inherent to the one trait that requires the absence of the other, and more importantly the absence of one trait does not suggest the presence of the other trait.