Fact: Cass should get to interact with more Bat people. (And more non Bat people as well.)
Fact: Jason should get to interact with more Bat people.
Except for future retcons, Jason hadn't met or talked with any of the girls - Babs, Steph, Cass, Helena - any of the supporting cast - Alfred, Leslie, Jim - or any of the people whose retconned existence into the family would only make sense thematically for him to meet (Damian). And that needs to happen. My god, but does he think about all this? I can't imagine Winick's Jason never found out about Steph being Robin, even if he didn't know in UtH. Is there any reason at all except the no-mentioning-the-Bat-females policy in practice at DC for Jason to not think anything about Steph? Or Cass? He was mad that Bruce replaced him with a new Robin that Jason feared was better than he was, what the hell did he think of Bruce apparently replacing Babs with Cass?
And while we're at it, is there any place where Babs mentions Jason's return at all? What does Babs think of Jason playing the victim unavenged by Batman? (I think she should kick his ass, it can't be just me, right?)
Fact: Jason + Cass meeting = YES DO WANT. Just give me a writer that'll do them justice.