Well said. Perfect synopsis. Parallel world is limbo. The part I really dug was when Hugo picked up Desmond, Sayed and Kate from Anna Lucia's custody. It confused me a bit, but now understand that since she was killed on the Island, her soul refused to let go yet, hence why Desmond (or was it Hugo) said "she's not ready yet". She hadn't yet come to terms with what happened, and was still creating a life around her in limbo.
That makes me wonder a lot about several back episodes where Hugo was talking to the dead.
doug