Faraday implies in the gallery that once humans became immortal, they lost touch with their emotions and now aren't as capable of feeling anything—good or bad—as they once were. The fact that Rowan can and does experience deep emotions in the gallery indicates that people are still able to reach down and draw on some sense of collective memory in order to tap into those emotions. This, Faraday would likely suggest, will make Rowan a good scythe, especially given that the novel overwhelmingly suggests that a good scythe is an emotional and compassionate one.