[PvK]

I think Arralen had the answer. Given the damage and affliction system described, it would be more likely for huge beasts to get afflictions over their lifetime, particularly when fighting lesser opponents, because they tend to survive many more blows than weaker units, who tend to die more often from fewer injuries. Players no doubt also tend to check their big minions more frequently than they check all of their little minions, so they also may not notice all the limps and amputations going on amongst the cannon fodder who survive. When I play Ulm and try to keep my well-armored humans alive, I notice that many of the veterans end up with afflictions, if they had to do a lot of tough fighting.

PvK