The show is called Star Trek PICARD.
There is no way in any kind of frozen over Hell that anything from DS9 will be a big thing in season 3 except for maybe a name drop like they did a few times in season 2. That's it.
I'm a friggin Niner, ok? It's my go to Star Trek show. But TPTB for this era of Star Trek literally give two things about DS9.
FUCK and ALL.
Please.
1) Worf is a DS9 character. As are O'Brien & Keiko.
2) Avery Brooks is a strange cat and may not be interested.
3) Rene has passed. As has Aron. So Odo & Nog are out.
4) Jadzia passed on the show.
5) That leaves Kira, Bashir, Jake, and Ezri if Brooks passed. Jake is not Starfleet and Kira would be more concerned with Bajor. All have few (if any) ties to Picard.
It's a show about Picard. Who makes more sense to be in a Picard show, TNG characters, Borg characters, or DS9 chatacters? It is common sense, not some crazy anti-DS9 bias.
Plus, DS9 ended fairly well. Sisko was a bit of a loose end. But Kira and Odo had an ending. Ezri & Bashir a beginning. Mikes & Keiko had their story. As did Rom & Quark.
TNG needed repair after Nemesis. And while Picard has stumbled with some plot points/believability/sonic screwdriver issues, it has done a pretty good job in my view. Not a homerun, but a solid double.
From TNG, we got Data, Riker, Trou, and Hugh in S1. In S2 we got Q and Guinan and Wesley. Beverly should be there at some point, ditto Worf & LaForge. I think that pacing & spacing is about right.
Plus, I really liked Jurati, Rios, and Raffi. With a bonus of Seven & Elnor.