If that's the case then you probably noticed as well...... that if you are at a group function(say a dinner of 10 0r so people).....you probably have trouble concentrating on everything going on...as it feels like you are everywhere and nowhere at the same time.........till you realize that all you are looking for is Fi stimulus....and if you can slowly aquire enough of it piece by piece you become extraverted with your Ne......till then you somewhat remain fairly quiet for the most part.....which is somewhat contradictory to being an extrovert.
I thinke that Beta ENFj and INFp have a much better grasp on such a group function cause they are at ease with such an Fe situation...and thus even an INFp may look more extraverted than an ENFp......i think that ENFps prefer to deal one on one, one on one, one on one etc.(and a lot of it) if they had a choice....but it takes a while for this phenomena to emerge.....takes a while for these connections to be built up...
....i don't know...that's just what i think.