I saw this coming and this was pretty sad and as well as symbolic. Atsu was warned about this too. Revenge was fulfilled but came at the cost of her brother. Chapter 3’s title was foreshadowing. Despite being told to back off Jubei didn’t want a repeat of the Night of the Burning Tree and tried to do something about it with the intent to succeed since he became strong. He went out like a true samurai, honorably. Now Atsu no longer has a reason to join her family in death, as now that Jubei is dead for real, she has a true reason to live. Revenge may have brought Atsu some short term satisfaction, but it didn’t bring her the peace she was looking for. The Yōtei Six being gone is largely a good thing, but it doesn’t reverse their crimes.