Strange Apparitions stands up on its own, however.

That's why I suggested that the unrelated stories would fit better in a separate volume.

In a perfect world I'd like to see the following separate volumes:
  • Miscellaneous Rogers Batman work (Calculator, DC Special, the Secret Origins GA Batman story, maybe even the Clayface arc);

    Strange Apparitions, ending with the Laughing Fish;

    Siege

    Dark Detective


In the end, you'd have three different Rogers "novels" plus a short story collection.