I can't get over how much I hate everything they say about Cass. There are some great Cass/Bruce moments, but turning her into a character who was about finding a fantasy dominating father to replace the bad dominating father, who's now going to collapse in response to his death this way? Ick. That was the whole reason Barbara was a better mentor for her.
I can't understand how they can do that while they know they've got Dick, Jason, Tim and Damian in those whole somewhat well-done drama about how a family grieves, without involving Cass even at all. It feels like basically what happened was that somebody decided Cass was too good for Barbara, and they were able to push that enough to shove Barbara aside so Cass could have scenes with Bruce, but not enough that all writers were ready to integrate Cass as an actual sister. They should have just had Bruce say "I should have told you before, but we all like having you on the team."