See, I wasn't even thinking of Jack. I think we get stuck on an idea and have trouble coming up with better theories sometimes. The implant thing is likely not going to play another role in the story, I just had forgotten that she already had a health concern on the island. No one ever dies of an illness, partly because of the character of the island but also maybe because it is less dramatic. It would almost be refreshing for her to get sick and die rather than be shot in the back when you least (or most?) expect it. Claire's fate may have been sealed on the day she was dropped onto the island as a pregnant woman.

Or she gets thrown off the helicopter by a desperate Kate who knows if she returns to civilization with a baby, the juries will go easier on her. I can see it now...