Well, Fin, in his dialogue with Altenna, cries and It's not improbable to say that It's because he is indeed glad that Altenna is alive, but It's just an assumption, sinfe he couldbe crying for other reasons, such as not having tried to search her.Leif, in my opinion, is kinda of justified to not have such a feeling towards Altenna since he has literally no memories about her.
Anyway, Areone probably assumed that his father didn't want him to surrender by the way Travant acted towards the Liberation Army until he decided to "suicide". Or maybe the devs just wanted to make the player fight a wielder of the gungnir.