Well, whether he's met her or not doesn't really matter, does it? My uncle hadn't met my aunt until they day they got betrothed - their parents arranged everything for them. And I don't think it matters that she's so much younger than he is if he's thinking to wait until she's finished school. My Dadi was about twelve years younger than my Dada, too.

Anyway, I'm certainly not going to be the one to say anything to Auror Crouch - but if he didn't want anyone speculating, he really shouldn't have sent them in the first place!