To be fair, I was joking when I mentioned Barbara, because of Timm's long obsession with her and Bruce screwing and what happened in TKJ movie. I haven't read the comic so I don't know who the bad guy ends up being, and from what you said it won't be a big surprise apparently, but I don't really think even Timm would have the person writing the script change the ending reveal. I don't think Mignola is bad artist, just that his style really only works (for me at least) in a few specific contexts. Looking at his GbG art online, it really doesn't work for me there. His stuff is more for certain kinds of horror or supernatural stories, where it being weird, off putting and unreal is a good thing. But when the story is Batman vs Jack the Ripper, a more normal art style just works better in my opinion.