I'm re-watching Lost and haven't got back to the bit where we find out about John being dead to check the details, but it got me thinking. We see a lot of dead people on the island, or people who couldn't be there. The implication is either they're delusions or 'magic' but in light of what we find out later about John and the Smoke Monster, does this imply every time we see such a person, they are really present as their monster takes their form?
Specific examples I wonder about...
- Echo's brother
- Jack's father