No one is getting anywhere this way so let's try a different way. Sakura, in the event that 1 action affects or prevents another action, who's action would go through? You mentioned that saves come before kills so. . .
Jealous's save
Rem's save (if he uses it)
The Kiras' kill
Kyome's kill
Mello's kill
Shidoh's kill
Rem's kill (if he uses it)
spies and Matt's wiretap
Saves prevent kills
Kills prevent spies/ Matt's wiretap
Let's say that all the roles who have kills tried to kill each other. For example, let's say that each role with a kill on the list above wanted to kill the role below them. (The Kiras want to kill Kyome, Kyome wants to kill Mellow, etc.) Who lives and who dies?