nosebleeds ---who was on island before ? ?

what about when they were skipping in time, and juliet sawyer miles got nosebleeds but dan did nt(or locke or jin) dan was nt born on the island ellie may be pregnant when she kills dan, and could this mean sawyer and juliet were on the island as babies/young children as they don t remember ? (because locke would have gotten a nosebleed too from the same amount of exposeure as sawyer and sawyer s nose bled) thoughts ?

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