[Morgan.]

I doubt they're all dead. My guess is

Spoiler:

Ross.

He's the one we know is leaving at some point. I think writers have realised Debbie needs some form of happy ending and/or explanation so Joe will live. And I think Kim will survive - it'd be stupid to kill her off after being back 4 days (I know it's only a week she was coming for but I think death would be extreme).