Re: One more thing...
I think that if they had really wanted to make the adoption of Cass prominent and important, it should've happened in Batman, oddly enough. That would have been a better acknowledgement of it, and they would have been forced to actually justify it, in a sense, instead of it just being the sloppily-written hero's reward. Which reads to me too much like "btw, since you're done killing people, here, have a legal document and a hug."