Well... I understand who says that Grey's death (even Droy's etc... <.<) would have raised the manga to a new level, I think that too.
But I just love to much Grey's character that I'd have hated to see him irrevocably dead. And maybe the fact that he saw himself dead maybe will change something in him.
But at least one "important" character is almost dead or is already dead. I feel sad for Ulter. She was trying to redeem herself for her previous life, and she was succeding. And her last sacrifice for "everyone" is proving it.
But to make a character sacrifying for others because she thinks that she is irrecoverable and she's no worth of living is some kinda anti-moralistic. It would have to be "I sacrifice my life because I love you guys, I am indebted to Grey, and I want to save him and everyone, because I am the only one who can do something really useful like turn back time" and not "I want to die and sacrifice myself because I have less worth of living than everyone else so at least... lets do something useful like saving everyone ". I see it like a suicide and it really disturbs me that Ulter was described so weak in her last moment of her life. She would be brave if she still have wanted to live.
And dying believing that your own sacrifice has worth nothing is even more creepy. Because you're thinking to die for redeeming yourself but NO: You thought your life was worthless and now you're dying thinking that even your death is worthless. Really creepy.
Hope someone will recognize her sacrifice.
ps. or maybe she isn't dead yet lol