User blog comment:Godisme/The Shooting Star Project (Zero Mix)/@comment-4006918-20121201223441/@comment-3143776-20121201225642

And with the 2nd part of your response, Ariock, Grimmjow can never become a Shinigami. Even if he died. He's a hollow. When hollows die, their soul gets purified and set to Soul Society. If that happened, he would have shown up in the Rukon District and not in Hueco Mundo. And Ginjo and Tsukishima are NOT Shinigami either. Ginjo was a human that happened to be a substitute, like Ichigo and Tsukishima is also a human. When they died, they ended up in Rukon District as souls, not Shinigami. Whether or not Ginjo still has his Shinigami powers is unknown, but probably.