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Going off of what Guest Speaker said about them being introduced as the 6th and 7th people. Perhaps 18th person on the island is just a title given to Erika as it is assumed that there are 17 humans on the island before she arrived so she would be given the title of the 18th person. It's not how many people are actually there. Just like how 18th person X is a title given to a person.
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