Guesses and subjective impressions:
A: strong sensing, Fi? SEE I guess.
B: Gamma/Delta, intuitive, rational -- LIE I guess
C: IP. not so much into sensing or Fe -- ILI, I.g.
D: strong sensing, irrationality -- SEI I guess
I'd guess/observe the following --
a) Minde is best integrated in the group, perhaps less so with A
b) B and C are particularly close
c) B doesn't really mind D, but they're not really close.
Question:
What is it with opening their mouths when you take a picture? It's gross.