For a moment Soujirou stopped smiling. There was an almost entirely too serious look on his face. Then it was gone and he was back to grinning and nodding in agreement with Aizen.

"...is that so, Aizen-san?" Soujirou replied, not asking for more information, but not actively resisting any either. This was like talking to Himura-san, only better, in a way. Perhaps he just needed to apply himself to this other way of thinking to make it make sense. "I haven't thought about ghosts, if there are any, none of them have ever troubled me~" another priceless smile was offered up.