DR going away upon killing confirms DR Loki is happening btw.
The purpose of D&B getting DR'd was to show us that.
If we don't have DR Loki, there's literally zero pay-off to the DR plot point, which would be rare for such a significant plot point throughout the arc, both in the past and present.
Furthermore, seems Zoro has no opponent, meaning it'll end up being Luffy and Loki vs Imunko then Luffy, Zoro and perhaps even other SHs vs DR Loki Oars-style.
At least, outside of Shamrock returning, that's the only way Oda salvages this tensionless battle.