Removed from list, doesn't exactly mean BA can't use said model in any format. The prime example of this being Candy, who after being cut, was used as a background character within the Below the City series as a damsel being fucked.
Stacy is probably not coming back as a single model again, given she's initally a byproduct of Stella, a DG that fans wanted to see as a non DG. Off topic, but it feels like a minute since we got ourselves a DG x Girl.
Reason to use Stacy and not someone like Jane, is most likely due to the already established cast that is known to be on Mars. I'll be honest, am surprised that BA has added to this series given their initial announcement way back when. But if BA does continue this series, I want an orgy for it's ending.