Simply because Kagura is a fake. He doesn't even exist on his own right, he was just ripped out of Amata and than given false memories. This isn't like brothers or the such which are born together, Kagura literally didn't exist until Mykage made him exist and with how things are going there's a high chance he will cease to exist again and get put back into Amata.
So yes, Kagura is a fake compared to Amata who is the real deal that has always existed.
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