Fourth Darkin Speculations/Theories

What if the fourth darkin is a darkin that fused with a darkin instead of human? Like, the 4th Darkin killed and fused with the 5th Darkin in an attempt to stay stable. This could solve the 5th Darkin and fulfill the Four Horsemen of the Apocalypse vibe. I'm thinking that a darkin corrupted human killed and fused with another darkin corrupted human.
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