I think this is an interesting idea about mirror types- it almost sounds like one person is 'too good' for the other. I know a couple of mirror couples- one of them I am related to. I think their relationship looks a bit like supervision to me- one appears to be the leader and one appears to be the 'special one'.
The other couples I know are ESE-SEI. In one couple, the female ESE is the clear leader- she is very smart and ambitious. I think she motivated the SEI to work hard and take his education more seriously. In the other couple, it's not so clear who is the leader. It may be the male SEI. The male SEI had more wealth in his family and the ESE had a more traditional education- he is a farmer and she is artsy. So again, maybe these relationships have a bit of supervision feel where one person wants to lead and the other person is happy to follow.
Anyway the reason I was thinking about this is because I was thinking about how horrible it is to like someone you think is 'too good' for you and they don't like you back (and worse, they're mean about it). It keeps going around and around in your head that they really were too good for you and the rejection hurts so much. If it was someone else who was 'too good' for you but you didn't like them, you wouldn't care. It's about that particular person. So yeah, reading about couples where it's normal for one to be the 'superior' person weirdly makes me feel better about being not being liked by someone I admired and who was a friend. Even if mirrors/ supervision aren't the best ITR and example to follow.

