None of them are actually confirmed dead. Cang Du so far has lost only an arm. Everyone looses an arm. Hell, Hiyori survived a bisection.
Unfortunately Cang Du lost a little bit more than just an arm, that cut removed a good third of his body. I wouldn't hold too much hope for poor BG9 either, considering Yhwach gets stronger the more SR's die.
There isn't really anyone I wish didn't die
period, but I do wish when they died was a little different:
Sasikabe: Could have used some more character development and foreshadowing, give us some clues Yama actually gives a damn about this guy before he gets pinned to a wall.
Grand Fisher: I never really liked how Isshin just wasted this guy. Stunning lack of emotion for the death of the monster that ate Ichigo's mother.
Everyone important in Bleach is usually given a beautifully poetic death, so I wouldn't really change any of that. Everyone who doesn't is generally unimportant so I don't really care.