Unlike the Protoss, whose form was gifted, humanity stole its form from entropy. Unlike the Zerg, whose essence was harvested, humanity invented its essence through suffering.
The error was individuality .
If humanity could achieve the Infinite Cycle on its own, without gods, without a predetermined merging, then the Xel'naga were not creators. They were redundant . Amon’s war against the Koprulu Sector was not a war for control. It was a war against irrelevance. starcraft codex
That chain became the human germline .
The Overmind was never a monster. It was a fractal . Its consciousness was the sum of all Zerg suffering. When it consumed the Protoss, it tasted order. When it consumed the Terrans, it tasted something far more dangerous: memory . Unlike the Protoss, whose form was gifted, humanity