Skipping the... whatever the first ones thing is because I'm honestly not quite sure what you're suggesting... and focusing on the chupacubra: you're conflating several completely different ideas again. Goblins domesticate chupacubra? That's an interesting thing. Dark elf elite defences for a warm Aztec-goblin place when the dark elves are basically in Iceland? That's a logical jump.

I'm finding it hard to say much about the ideas you're proposing, because it keeps starting with a simple premise and ending up with results that have knock-on effects on major cosmological points (or are just plain confusing)