Rewatched all their matches. I have to say Koga really overexerts herself. When Saori was captain she was pretty detached with the whole idea that she is the captain. When Araki was captain, she was more concerned with the mental aspect of the team. But with Koga I think it gets to her head that she has to do so much on the court and not in a good way.
I hate to say it but "Jack of all trades, Master of none" is the best way to describe her performance this VNL.
Seki doesn't match this squad at all. I don't know who she's trying to have the best chemistry with but I didn't see her bring out anyone's potential which is what makes Wada's strength all the more impressive.