I've met what I think is my first ESI. I'm impressed.
Although he scored ISFJ in MBTT, I still think he is probably an ESI (I'm disregarding the whole IXXJ = IXXp thing). It fits him very well. He's a pretty moralistic guy, and he has high ideals and expectations. He reminds me of how some on this forum used to think I was like i.e. he has people he aspires to; Muhammad Ali, Mike Tyson, Vito Corleone, which makes me think he almost certainly has ideals of how he wants to be. He's very, very polite, and can be somewhat self-conscious. He has an air of restraint, and if you touch his hair, he'll flip in seconds.
I couldn't imagine his being my supervisor at all, and the guy I originally thought was my supervisor I don't now. In fact, I actually admire his moral style, because I'm not akin to it; it's rare.