This is indeed really in Koga and Aya characters and I like this had been shown before too, tho "auch" any way hahaha
Koga being bad at communication so choosing another ways and Aya.....Aya like last time choosing no to speak because she is angry and like last time too if she choose to comunicate, Koga is going to be in the step 5 of her plan hahaha
So in develoment of personality I think will give the win here to Koga; sure is not talking but she is reaching for communication in her way; Aya for the moment is Aya. Maybe is becausa Koga really passed some really bad times (sure Aya too but we saw more of Koga that time) and had a really good support in Narita.
And really want in the future to see chapters in which Koga is happy and we are in her point of view. In the "first part" sure, we see times like that but she still couldnt be 100% her and in the second part was all Aya hapinness but the moment angst appared it was again in Koga view, that hurt haha