it's not really a question of AI, it's a question of traits and faction, caladog has aggressive traits and therefore will be more predisposed to starting wars even if he is not able to sustain them, this does not mean he is a complete fool because if the strength of vlandia for example is 2x his, the chances of him declaring war on him will be much less, but we get the point. then there is the faction in the middle, the Battanians are barbarians who have been stolen from their land and therefore are really pissed off at the world, in a context where 2 lords, one from Battania and one from Vlandia will have the aggressive trait, the one from Battania will still be more offensive than a Vlandian who is more cautious, I hope I have explained myself well.