Have any of the losties ever had anyone with them when their loved one was suddenly "missing" ? Eko was alone when he went into the airplane to look at his brother the second time. When he discovered he was missing, did anyone like John or Desmond double check? (I can't recall. I remember John stating the fire could have destroyed the body, but I thought that was before Eko went into the plane.)

If no one else was there to witness a body being there one time and gone the next, could it all be a figment of the imagination? A play on the conscience?

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Everything should be made as simple as possible, but not simpler - Albert Einstein