Those might've been cancelled books.
I'm not sure that all of them, or any of them really, were canceled. The Ray for example seemed to just be a miniseries. I was expecting that The Ray would show up in another book though. He would've been a good fit for Justice League International, but that did get canceled. Granted if the Ray mini really took off with readers it might've have gone to a full series but I don't think that was the intention.