Board Thread:Questions and Answers/@comment-28414362-20150325191838

I know it's frequent question, but answers i found weren't united or intelligible. So i ask- What happens if Shinigami (or other Souls of Humans, Quincy...) dies in Spirit Worlds (Hueco Mando, Soul Society)? Will they reincarnate as humans in Word of Livings? Or will they just (sadly) disappear? 