User blog comment:Godisme/The Shooting Star Project (Zero Mix)/@comment-4006918-20121201223441/@comment-4006918-20121201230651

It's weird though because I thought Nel (or Pesche?) said Harribel became ruler of Hueco Mundo because the other espada were dead. Also I found this image in other forum.

http://imageshack.us/f/607/42379wvspd16pbvot.jpg/

It's confirm by Yammi (or Ichigo?) that Ulquiorra, Noitora, and Grimmjow are dead. So yeah we know he surely died after Noitora attack him.

It makes sense he's shinigami because then he could become ally. I'll just wait for Kubo to show the person's face I guess. It could be a new character or someone we don't expect.