I just realized a (the?) solution to Erika's "18th human" line at the end of EP6. I'm surprised I hadn't thought of it earlier, because it fits perfectly with ShKanon Replacement Theory.
It's about the "th" in "18th". The game has had 17 people other than Erika, making her the 18th person. However, the game actually only has 16 people other than Erika, making the total, with Erika included, 17.
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