Hmmmmm, no. And, wow.
You're basically saying that "NTs are smart because they are NTs".
You've defined the terms to fit your conclusion, which works in your model and I "get" what you saying and also what you seem to be implying and I totally disagree.
You're not saying that NTs are the most "intelligent type" (but you're just one extrapolation away) but you are saying that by definition an NT has to be intelligent. And I'm still not clear what your definition of "intelligence" other than an NT way of thinking?
Every MBT type describes a way a type understands the world and processes consciousness, which are forms of intelligence.
Just because you like making arguments on what you think is logic doesn't mean that they actually make sense to anyone else. Of course, you can just say that "everyone else is stupid" (which people do all time )
If you define "valuing rationality" or "strategic thinking" or Ti/Te the cognitive functions themselves as a high quantifiable amount of intelligence then sure, by your definition NTs will be intelligent just because they are NT.
However, I think - no, scratch that - I know it's possible to be an NT of average to below average (or impaired) intelligence. You just prefer a certain way to understand and relate to the world. Kind of like what Heart was saying with her story. And maybe your IQ is higher than your "EQ". But, does that make you "intelligent"?
Just like your own personal best subject in school is chemistry or music or PE, but that doesn't mean you excel in those subjects compared to other students. Or that you're even very good at them, they are just what you are personally best at.
And I will also say that looking at the quads, NTs are more likely than other types to define themselves based on intelligence or value their intelligence above most of their other attributes. So far you(r post and my brother) back that one up.
Bah, is any of this making sense?
But basically, no.
But maybe the definitions of "intelligent" that we're using are different.