I suspect that deep down Eirika was actually glad that Aya disappeared and was waiting for Koto to “move on” to try and ask her outSpeaking of vibes, adult Erika is a little off. Even the drunk president seemed more sad about Aya. Erika was framed as observing that grief as well as Koto's while she was just glad Koto seemed to be getting over it "at last".