I realy cannot confirm this. To my obersvation the armies of certain AI factions are always the same.
Let's take the Aedui and Averni for example: absolut the same line-up, save for some nearly identical elites. The early armies are most of the times composed of spearmen (Lugoae), the reaction of both sides should be to field more swordsmen, what should result in the recruiting of more cavalry. So, in the consequence the two Gaul factions should field tons of cavalry and close to no spearmen, also as a reaction of the Romans and their full stacks of swordsmen. But the exact opposite is true: cavalry is very rare in their AI armies and the spear the most prominent weapon.
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