It could also be the case that the mercs are effective counters on auto-calc? Horse archers used to be quite useless on autocalc, hence the Sauros hardly ever expanding on EB 1.0 (I think this issue was addressed in EB 1.1) and its predecessors.
If that is the case some unit stats could be looked at and redone. But first, we have to determine if merc recruitment is skewed to certain factions on higher difficulties. It might be due to the intricacies of the money script.
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