They're probably being set-up as the villains for season 3. Bo Katan was never the nicest of characters, just look at that Clone Wars village massacre episode. Katee Sackhoff on the other hand is great, so I hope she stays in this show or others a while longer. Personally, for season 3 I'd love to see an all out Mandalorian war season with 3 or 4+ parties vying for control of Mandalore. The show needs something that big after losing Grogu.
As for the figures, love the designs for Bo and Koska, not so much for the guy. I might feel differently if he'd had more to say in his episode and hadn't been stuck in the loo for the entirety of the season finale. I'd still buy him to complete the trio, just not completely sold on his character yet.