Correct.INJs and ENPs are most intuitive, however they are not the best at using their Intuitions. INPs are the best at using their Intuitions because they are most judicious about their intuitions. (Introverted Judgment is the strongest form of judgment.) You do not need as much Intuitive power as INJs and ENPs have in order to apply your intuitions well, you need much less. INPs have just enough.
INPs are most eccentric because they are most determined to live their lives based on their inner standards (Introverted Judgment). Whilst, the INJs do create their internal vision to live by, that is indeed highly esoteric, however they do subjugate it to an external standard. (Extroverted Judgment) INJs mostly measure their success by 'aha' moments which are founded on internal criteria (introverted intuition), however, their only solid way to measure success would be by an external standard. Thus, this ties them to the convention. ENPs , as dominant Intuitors too measure their success by an external standard, but it is tied to the external world because their visions orient more around the external world rather than the inner world. Their Introverted Judgment is not strong enough to be the primary standard of self-assessment.
However, INPs go primarily by the Internal standard, something the ENPs cannot do. They are tied to the convention due to their external intuitions in the same fashion as ENPs are, but the tie is much weaker because the Extroverted Intuition is less significant.
Eccentricity is most closely associated with one's ability to apply intuitions. INPs are the most proficient at this because they are the best at assessing, it as they have the firmest control over their Intuitions. (The question here is, what good is having as much Intuition as INJs and ENPs do if you cannot make sense of them and thus cannot put your intuitions to good use?) INJs are better than ENPs at using their Intuition because their Intuition is stronger due to the factor of introversion. ENPs have stronger judgment than INJs(also due to the introversion factor), though this factor is to be thought less significant than the former because here we are comparing secondary faculties as opposed to primary.
Thinkers tend to be more eccentric than Feelers because they rely less on their external environment due to their higher propensity towards autonomy.