I think that the episodes get weirder and stray from the original formula of EP1 to represent that whatever happened in Prime was getting far from what Yasu originally planned. Touya probably read Legend and Turn, and tried to make a story that followed the formula but with the premise that "Ushiromiya Eva should be the only survivor". Then he wrote it and noticed "it (Prime) wasn't like this at all", so he tried a different approach on the following forgeries.
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