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The art can be quest-related; in this case, the value can be slightly less than 2000 (for level 1 units in some configurations) or equal to 2000 or more, in various scenarios.
As for the griffins and swordsmen being missing, the monks in the original game have a bugged, lowered AI Value (configured as if the monk cannot attack). However, even without bugs, sometimes higher-level creatures can appear in guards when lower-level creatures cannot, as higher-level creatures have a smaller minimum number that can appear.