For someone who likes to find the trivia behind mob models, you sure seem to be purposefully ignoring the reason behind those models in XIV. 2.0 was the result of turning a failed MMO (1.0) into a success, but they didn't have years and years to do so. They used models from XI, XII and XIII to save time and resources, which is why pulling mob models straight from other FF games happens less, nowadays.
That said, it'd be neat to get the Kingsglaive set for glamour.