In Season 4 Kate had a dream about Claire. Claire was tending to Aaron and when Kate interupted her, Claire warned Kate “not to bring him back”.
The persumtion here is that Claire is talking about Aaron. But lets put another spin on things.
What if Claire was talking about Locke? Locke is now dead and we know Jack has to bring him back to the island. We’ve seen that dead people can be resureccted once on the island (Christian), so what if Locke is resurected and bad things start to happen again?
It could also be Ben. Ben has done alot of things that he thinks are good for the island but result in deaths of people etc. What if Claire was warning Kate not to let Ben return to the island?
Food for thought, no?