Which did Cassian find more endearing: Argi talking to them, or Jyn talking to Argi? Hard to say. He found himself doing things like smiling, spontaneously, at nobody. And had to firmly frame his mind with enjoy the current moment, in of itself, don't link enjoyment to expectation or duration, only now no farther… in order to simultaneously not shy from nor get addicted to (…too late…?) this feeling. He found himself running conversations with Kaytoo through his mind as he opened the door to their quarters and held it for Jyn with Ilargi to go through. (Maybe because Kaytoo was his bastion against such sentimentality? Maybe because Kay was the sense of family that could persist?)