User blog comment:Garybusey92/Izuru Kira's Fate/@comment-10630156-20130610105830

from what I've seen in the manga I'd say that he could be mayuri's 'experiment' gaining artificial parts or something along those lines as a result, here are my reasons for thinking this:

1. it is clear that they (mayuri and nemu) are operating on someone and the only severally wounded person unaccounted for (that I know about anyway) is Izuru

2. it hasn't been stated that Izuru is dead but his injuries would have killed him unless there was an Orihime class healer around which their wasn't. his only hope is the mad scientist (poor guy)

3. Mayuri took out all the cameras in the room. if their is one thing that he wouldn't want it would be Rojuro finding out about Mayuri experimenting on his lieutenant