Board Thread:Questions and Answers/@comment-31283382-20131221170348/@comment-27111726-20160715075935

It was proven that some famlies in the soul socity can share a zanpakuto and pass it down form one member to member or someone else's altogether. like the lea clan. So if Sōjirō Kusaka and Tōshirō Hitsugaya zanpakuto was a similar type then its possible that. it was one spirit that split in two by separating into yin and yang forces (like kurama from naruto) cause it couldn't pick a new master it would be like they were twins just one being good and one being evil