Remember the part where Slim tells us that the previous experiments with his “kind” went horribly wrong. “Failed experiments?” Where Sunny get’s all enthusiastic to think that Slim is an actual Alien? Where generation one was more insect than man, not even capable of following orders?
What if the same theory can be applied to the monsters? A genetic experiment with humans that went horribly wrong. Recreating tissue with DNA from various animals that the Hunters have caught in the past? Applying it to humans, but ‘the beast took over’. There seems to be no proof of intelligent life besides humans in this universe. What if the monsters are man-made, what if Shear was a base to try and harness their powers? Maggie said that Factor only had two monsters, the Behemoth and the 5th monster. What if the Goliath, Kraken and Wraith are actually originating from Shear itself? Well… a man-made origin then ofc