For armor is better create improved version of unit, don't you think? A irregular with armour is not too much irregular. Also leather armour was not so little expensive at that time. Take present the balance of unit (especially for multi) has been very accurate so cost, upgrade and numbers of a group are in strict rapport with those of other units. Usually they test very long a new battle mechanic or unit before release it for avoid to create unbalance in the battle.
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