I think this means the coffin holds someone who may mean a great deal to Jack in a weird way (since he didn’t even want to go to the funeral yet he put his hand on the coffin and looked in emotional pain) who will be written into the show at a future date, or someone we already have met but whose character hasn’t been fully developed yet, female or male. I haven’t read this theory anywhere else, nor had I even caught all the clues until I saw the 2-part finale again this past week.

i think you will find that millions of avid fans and followers might disagree with your comment

1. How the hell was Charlie able to enter the right code in one try when he was a guitar player and not a telephone operator?

2. Charlie was able to complete his mission which was to disable the radio jammer. Why the hell would he stick around, lock the door of the hatch and drown himself when he has already accomplished his mission. The practical thing to do is swim back to the surface when the station was getting flooded.

This only shows that the writers and the producers lack critical thinking and treat their audiences as if all of them are stupid.

1. Ben asked Locke to kill his biological father Anthony Cooper as a ‘gesture’ to show the OTHERS in order to become one of them. Locke pointed a dagger on his dad’s neck but was unable to kill him because as he had said ‘he is not a murderer’. Instead, Locke fetched Sawyer and Sawyer killed Locke’s dad for him because of a rediculous coincidence that Locke’s dad Anthony Cooper aka Tom Sawyer is the same person who had sex w/ Sawyer’s mom which resulted into the murder of his mom and his dad’s suicide. At the last episode of S3, Locke killed Naomi with his dagger while she was trying to call the rescuers from her radio? Have’nt he said that he is not a murderer? He could’nt even kill his dad who conned him his kidney and pushed him from the 8th floor of a building that caused his paralysis.

2. At the end of S3, Kate met with Jack near an airport (obviously they were able to get out of the Island). Why is Kate free? She blew up her moms house to commit insurance fraud, killed her step dad, commited a bank robbery, etc., etc. She should be in jail serving a life sentence.

3. Jack had an argument with a doctor who was questioning him if he had a drink (a spoiler clip, obviously a future scene that had happened). He said to bring his father down and if his father is more drunk than he is then, the doctor can fire him. Isn’t his dad already dead since S1?