In yet another interview, Oscar Isaac talks about how Episode IX was the most fun (again) but also does some heavy lifting for Finn/Poe (or Finn & Poe, however you care to read it):
I think the one thing I can say [about Star Wars: Episode IX] is that it has been the most fun for me, particularly working with John Boyega because we have just had so much more to do together and we just really connected in a great way. It was really a wonderful way to finish it for me because John was the first person I met right when I screen-tested. It was just with me and him. So it just felt like a real full-circle thing.
We do have some illicit evidence (by which I mean possible spoilers) that points towards their adventure.