I knew cindylou would show up on this thread!!!
The house I think is where "Jacob" lives. Remember, Hurly saw the rocking chair as well. Same one Locke saw.
Oceanic 6 - remember one of them died after rescue. At some point. Remember the funeral where Jack was the only one there and he and Kate talked about it. She said "I guess you went" or something like that. Obviously the person had no friends/family. Maybe it was Ben or another one of the Others.
Or maybe there are more that didn't get rescued and are still alive. Remember Jack asking Hurley if he was going to tell? Jack is really desperate to get back to that island.