Yes I'm presuming Joe is sick, probably dying and that's why he came back.
Now that Dawn has the usb stick/memory stick/flash drive thing we'll be subjected to endless nonsense of screaming, blaming wondering what it's all about and it will all be aimed at Kim, tedious... absolutely tedious.
I feel sorry for Ruby, I know she was a cow in the beginning but she's really really good, I remember many months ago she was talking to Chas and made some reference to her childhood, can't remember what but she was very agitated and was digging her nails into the table while she was talking, she was very anxious at the time.