@potoytoie Miyamoto Mushasi is a popular figure in Japanese History (kinda like Stonewall Jackson or Benjamin Franklin). Probably not a reference to Vagabond specifically
were the two ever related? like the manga industry is a decently big place, do we even know if these guys ever interacted? If not, this might just be a case of Urasawa using Miyamoto Mushasi because he's a really popular figure in Japanese History, and not because of Vagabond specifically