I read your post and the bottom line is: NO!!!!!! Do not meet the OM. Most people don't want their S to meet the OP.
I would say she wants this to validate her A and to compare each of you...do not do this. He really means nothing to you, so don't fall for this.
Try to cut off her talking about him, walk away. He seems to relate to her b/c they both have the same instability. You represent, the normal; thus you can't possibly know how she really feels. She can't compute that, as of yet.
Familiarity breeds contempt...it will take its course.