Currently there are only 7 main gear types at each tier which are Fending(heavy armor), Maiming(medium armor), Slaying(melee light armor), Aiming(ranged light armor), Casting (offensive robes), Healing (healing robes), Crafting (dress clothes) and Gathering(rugged clothes). As long as ROG/NIN shares an existing gear type such as Slaying or Aiming then there should not be a problem outside of tiers with AF sets.

The biggest cause of Armory chest overload currently is the 12 AF Crafting/Gathering sets.