#feel free to disagree i'm not an expert on jason

[casscainmainly]

The 'would Cass and Jason get along' conversation is interesting because it often hinges on whether Cass would forgive/accept/look past Jason's actions. A lot of people debate whether Cass' compassion outweighs her stance against killing, etc. I think this is the wrong way to go about it because the Cass + Jason dynamic depends on the person's interpretation of Jason, not Cass. If Jason is repentant/swore off killing a la Wayne Family Adventures or something, then yeah sure Cass would be fine with him (see the way she approaches past murderers like Alpha or Damian). But if your version of Jason is pro-killing (even the slightest bit, even the Joker), then no, she would not get along with him. And that's fine.

It's fine for Cass not to get along with every single member of the Batfamily. It's fine for her to have such a hard stance on morality it blinds her to grey areas (which is a canonical issue for her). It's fine for Jason to forsake relationships he may or may not care about in favour of his own morality, too. I think it makes sense to believe Jason and Cass get along, especially with where canon!Jason is now, but it should hinge on Jason changing, not on whether Cass learns to understand him.