big mysteries of the bleach world: what happens when people die?
We know that when hollows are cut by a Zanpaktou, they are purified of whatever wrongdoings they did as a hollow (who decided what wrong was, the soul king?) and become a regular human in the Soul Society. This doesn't work with quincies, which use reishi weapons. But does that mean that kidou doesn't count too? If kidou counts, then can quincies use kido? They haven't shown to be able to use kido, is that because they're humans with physical bodies? But Ishida and everyone else had to have reishi bodies when they entered SS. When quincies die, can they enroll and become shinigami in seireitei?
So okay we know that after shinigami die (or get killed) they don't reincarnate, they just die and their bodies, or I guess souls, decompose and become reishi…minerals? (my source is Kaien-dono, I'm assuming he read a ghost book about it) So souls don't come back after they die, and they don't reincarnate in the human world. So that means that in order for there too be balance between the two worlds, SS has to have natural aging and souls die naturally. So a soul has a life on Earth, dies and goes to SS and then dies finally.
Maybe I'm over thinking this. Sometimes I do think people worry too much about plotholes, and these kind of questions are irrelevant to the quality of a series. After all, I like YuYu Hakusho, and that series has a confusing and unexplained afterlife too.
Also I don't know if the volume extras touch on this, but I'm very hesitant to pay money for Bleach, I'm sorry.