@mammaria
I mean, regardless of his intentions (and from seeing the raws, emperor thankfully stays as a good guy), the pros in having her as a daughter in law are just A LOT
1st, the problematic son of his is already interested with her
2nd no more issues with the marriage
3rd, he has the Chancellor on a leash. Unless the chancellor and fam start a rebellion first
4th, capable in laws
5th, trustworthy in laws/allies (unless they're so overprotective that they'd backstab)