HOLY FUCKING SHIT!!!!! you are right. I've been playing this game CONSTANTLY since January, and I never notices that.
YES, there are 4 Guardians (Hp/EXP 7) and I have only now, thanls to you, I see that they show their place in in the grid on their shields..... So I assume there is only one per quadrant.
I'm gonna play with this and see if there's a pattern,
Thanks fam