Yeah, like you and Omenix, I picked up the Dark edition, which I have never regretted!
I had run across the standard Kaos Trap twice before but I didn't bother. It's only now that I've seen that I don't always like the look of the evolved Villian that I thought the second, distinct trap would be a good option to store both the un-evolved and evolved versions of Kaos! The smaller being the un-evolved version and the bigger, deluxe version will be for the evolved Kaos.
I figured Kaos was worth the extra fuss  
