Glad you like the artwork! We are pretty happy with them as well
As for your question, I am writing up a blog post today (it won't be posted until next or or possibly the week after because it needs to be translated and rubber stamped by my bosses and their bosses and their bosses bosses and their.... you see where this is going :P) that will explain this aspect of Warzone Arenas and more! Sorry for the tease but it's an in-depth answer and best to keep all the where, whys, and hows in one place.
Sounds like to many bosses and not enough folks working on the game.....and thank you for your post