When the phrase "Books of Magic" showed up in JLD, I certainly thought of Tim Hunter ... be great if these projects happened!
On Cain/Black Bat: I'm not sure I agree with a blanket statement about Gail Simone fans. I'm a Gail Simone fan, and I came up with the idea of Talon/Cain,* so ... But I agree that Black Bat is a fandom shibboleth, just like Steph Brown.
* Not alone or anything, as others seem to have had the same thought.