Significance of Rose?

So John Locke was healed by the island in that he could walk again and this is a big deal. What about Rose? She was healed too. Is this a big deal in a way we don't know yet? As far as I can remember, no one else was healed so miraculously other than these two - Ben had to have surgery, Jack an appendectomy, Sawyer lots of antibiotics...why would both Rose and Locke spontaneously heal?

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