Quote Originally Posted by LaZodiac View Post
Only thing I can think of, that hasn't been mentioned yet, is that maybe the Zeroth Division weren't born Shinigami. Maybe they're all like Ichigo, humans who have recieved Shinigami powers.
Or they were humans who died and got into Soul Society that way, rather than being born into Soul Society.

I presume that it is possible to gain Shinigami powers that way anyway.