Black and Bronze being next to each other does sound visually appealing. Good call.
Dalaran and Acherus were there just to pay homage to the "leak" that's seemingly captivated this thread. Since the leak mentions Order Halls returning, Acherus would have to be there too.
Basically, I just thought it looked cool and I wanted all the zones to be connected with Uldorus in the middle. That's all.
I don't actually remember/know what you're referring to with the "dragonshrines aligned in Dragonblight' as I haven't been there in ages.