Why couldn't Richard, Ben, or Sun recognize that Locke wasn't Locke when they were on their way to the statue? Everyone else seemed to be able to (Kate, Sawyer, Jin, Sayid, etc.) I understand Kate had a problem with it because she knew Locke had died but Ben knew he had died too and he couldn't figure it out. Did Jacob's death have something to do with them being able to tell? Maybe only the candidates can recognize Locke is not Locke.