In my opinion, people of Falconia are kinda fucked.
So, Griffith will definitely bring Casca to Falconia, but won't it affect on "war demons" and apostles, since Casca has a brand of sacrifice? Not to mention that Shierke for now won't be able to use a "magical talisman" on her brand.
I know that Griffith will definitely keep them in check (like he did before) and most likely protect Casca from them, but won't a sacrificed human being become a "trigger" to awake their hunger for human's flesh?