What if Dick mistook Danny as a hallucination of Jason the whole time?
Up to you why he's with Dick anyway, or why he's the only one that can see Danny. But from time to time I imagine Danny still talking to Dick after all that Red Hood stuff and says the weirdest shit and believing it:
Dick: Wonder how Jaybird's doing
Danny: I have another hole in my wall again.
Dick: Oh.
Or acting like some kind of guardian angel only Dick can see after he finds out that Danny isn't Jason and isn't a hallucination:
Dick: *breaks toaster*
Danny: Alfred saw you and Bruce is coming, book it, hURRY-
I dunno, just Danny and Dick getting along. And if anybody asks how Dick knows stuff he shouldn't, he's just gonna say something else:
Dick: Damian brought Batcow into the manor.
Steph: I haven't even told you yet, how do you know?
Dick: You drank Tim's coffee, he hasn't slept trying to find out who did it.
Everyone talking about how Danny and Damian would meet in them Al Ghul AUs (or honestly any other reunion) with angst and seriousness but personally I think they'd just happen into each other in like, a mall or some other public area with the intro to Take on Me by a-ha playing in the background.