i've heard that college was the most peaceful part for a japanese. getting into the college might be stressful, but once they've got in it's basically done
my understanding is that she's not making Worcestershire sauce. she's trying to make something similar. don't forget that Worcestershire sauce itself was a result of a failed attempt to make another sauce
at this point i think it is inevitable that the duke would either rebel, or declare their independence from the kingdom. as a results of that, another country would invade the kingdom
i think she probably had an unrecruited love on ziegline, that's why she doesn't want her child to be beaten by his child (because it's obvious that Lily isn't ziegline's child)
now that he has unlocked a new area, i wonder if he would sometimes visit the place for sightseeing and met some kids that he'd befriends (probably some noble kids)