She's too good for him. And not only her character, I mean also stat wise. The whole point so far has been his effort in looking for talent in unlikely places, but I guess the author didn't think Ars would be cold enough to pick his own bride based on finding a woman with appropriate stats. So what does he do? The engagement is arranged by his father before he was born and he just happened to score someone with incredible stats and not average ones.
Which is a bit of a waste too, it would have been interesting to see an average person dealing with being engaged to someone surrounded by superhumans. Or Ars relating to someone who is not a superhuman and choosing them despite their stats not being stellar. A sort of "true love vs stats" arc where he has a choice of candidates (which the heir of a territory normally would, especially if they're growing in strength and gaining achievements), and he likes someone who is inferior, stat wise, to another candidate.