I have noticed that the accessory parts are kind of awkward for one type of helmet. The helmets obtained from the guardian prize box has all accessory slots open. The same looking ones: the Crescent helms give all but face accessory slots. Cobalt helmets give all but the top accessories.
Overall i just want to know why the crescent helmets do not allow all accessory types, and i would love to add a front to my newly acquired shadow crescent helm.