Webthe tsugikuni bloodline was an elite class of swordsmen who lost their heritage over time. On the other hand, the kamado family in demon slayer were charcoal sellers even. Webyoriichi eventually died of natural causes and didn’t have a direct descendant. However, his bloodline technically continued. Webit's actually ridiculous how strong yoriichi is. The final boss, who was nerfed like 4 times in quick succession, was handling numerous pillars, some of which had access to red. Webyoriichi pioneered sun breathing and forged the iconic red nichirin blade, establishing his legendary status in the demon slayer corps for centuries to come. Webas the creator of breath of the sun and the only slayer to ever come close to killing muzan kibutsuji, yoriichi‘s skills and legacy have captivated fans for generations.