True but generally speaking, according to the unit upgrade chain concept, the differentiation between the knight and this unit will be the intent to dismount to fight vs the intent to stay mounted to fight. They may even wear similar armors but the difference in intent should adjust the consideration as to how those armors are arranged. It's possible that some of the arts on these units will be adjusted for better clarity. Well then we can't keep calling the unit 'mailed' since that's an ambiguity that certainly isn't intentional here. You suggested 'Plate Cavalry' and that sounds about right.