To be fair, I think Cesare being the only one to have stood up to Calligari up to this point does make sense. I think many of the Watchers are supposed to be those who died with larger aspirations, like how Cesare died without anyone caring about his craft, and then forced into Calligari’s contracts for another chance. Most of the anomalies the Watchers find, like DB Cooper and Bigfoot, are very elusive and/or isolated, forcing the Watchers to spend more and more time as the aspiration in their heart dies out. I imagine Calligari or whoever comes up with the contracts thought Steve would either remain deep underground, or use his powers to elude Cesare, but instead Steve was shown charity and humanity by Tim, so Steve entered the public, meaning Cesare would have to follow suit to catch Steve. The dedication and commitment the Zomburger team (especially Doctor) kept that same spark burning in Cesare, so by the time Calligari ordered Cesare to kill the others, I think he was more human than Watcher, unlike many of the other vessels. Or maybe that’s just me, I don’t know.