That’s certainly a possibility, although you’re right, this Wesen god/devil’s concept of innocence would have to be pretty in-the-moment or subjective because we all know Monroe has some messed up shit in his past.
I personally think the other world is some kind of primeval universe where Wesen originated, perhaps in a less human form than we know them in our world in the show.
Wesen as we know them in the world of Grimm are humans with a hidden side that resembles an animal or folk creature–wolves, foxes, goats, sheep, rabbits, rats, snakes, mice, birds, merpeople, dragons, etc.
But what if they descended from beings that were less human, who had nothing to hide that side behind? Or what if the Wesen nature is more like a symbiotic relationship, virus, or possession? We’ve only seen a few examples to support this–hexenbiests, grausen, and lycanthropes–but that doesn’t mean there aren’t others. I mean, the methods of removing or reinstating hexenbiest powers are pretty specific, as are the conditions for creating a pure lycanthrope…which is not a Wesen as the term is usually understood, but has a lot of similarities with regards to dual nature, increased powers, etc.
Maybe it’s the same for other Wesen, and those conditions have just never happened because they are so specific and there have never been groups of Wesen, humans, and Grimms who were quite as cozy and wildly experimental as our beloved Team Grimm. I mean, the rest of the Wesen world seems to be pretty dedicated to maintaining the status quo, believing whatever’s easiest, and not asking a lot of hard questions (just look at how ready even Rosalee was to allow the Wesen council to murder a child just because he had an illness!).
But I digress. The point is…what if all of the strangeness the team has encountered–Grimms, Wesen, magic, mystical illnesses, etc–are all originally from this parallel world? What if Wesen nature roams this world freely in its purest form, without any human side?
I mean, going back–as I seem to be doing with increasing frequency–to all the similarities between this show and David Greenwalt’s other baby, Angel, what if this is similar to demonic realms in the Buffyverse? What if it’s like when they went to Pylea in Angel?
And if that’s the case, how will that affect someone like Nick who goes there, or someone like Juliette/Eve? If she woges, will her Wesen side be stronger and take over completely? Or will her Wesen side be significantly weaker by comparison in a place of such strong magic, and leave her unable to completely woge and protect herself and/or Nick?
Will Nick’s Grimm powers be stronger in this place, or weaker? Could he possibly have a more pronounced “Grimm form” that we’ve never seen before, and that we’ll get to see now?
Actually…what if Grimm, like Wesen, are originally from this other world? What if that skull face they keep seeing in the mirror is the purest form of a Grimm?

