[Edi]

That depends on what order it loads the mods in. The mod manual does say rather explicitly that different mods should not modify the same units or unpredictable results will happen.

In this case, the BI mod works correctly only if it loads last, because changes are applied in loading order and if there are conflicting orders in different mods (e.g. one sets #rcost 800 and the other #rcost 8), only the last to load is applied. If the two mods change different aspects of the same unit (e.g. one changes resistances and the otehr changes magic), there is no problem.