Ahh, I'm so happy to see more of AyaChisa! Maybe I just haven't been following the right people, but it always feels like there isn't enough of them.
I think it's because AyaChisa isn't very big in the international fandom. Aside from being overshadowed by popular ships like SayoHina, YukiLisa, and MisaKoko, it seems Endori prefers KaoChisa or KanonChisa. I am starting to see more fellow AyaChisa shippers after season 2 ep 5 though so I'm hoping we'll get more content for them.
Yeah tbh. I think you are right, I mostly encounter KaoChisa or the likes when I search around for fanfiction etc., but it's exactly this episode that made me hopeful that people will notice AyaChisa more. Imo it's such an intuitive ship, same band, the band story itself and plenty of interactions, and yet somehow it manages to get overlooked. Well, keeping my fingers crossed for more!