Maybe they can get involved,like be a big part of a plot? Maybe Silver or Star followed Lunar. Or,maybe they were in on trying to overthrow Lunar and Onyx as pack leaders.
Ooooh! Oooooh! I have a new plot idea. I see a spark with oak and Butterscotch. Why don't I make a wolf (or take one of mine) that secratly has a crush on Oak and wants him for herself. How's that?