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At the very least, we know that all the Lab Members (except maybe Daru) can recall the events that happened in the other timelines, so it's possible that Kurisu may eventually learn about about her death to be able to prevent it from happening.
Okabe knows that he has to undo his first D-Mail to (hopefully) jump to the original timeline again. Of course, losing either Mayuri or Kurisu (or even both in the worst-case scenario) is not a option, so he must find a way to save them both and restore order to the world (because I don't think he wants to live in a world where SERN pulls the strings).
I think what they need to find out is:
1. Who killed Kurusi in the original timeline?
2. Why did he/she do it?
3. Can any knowledge from previous timelines be used to persuade this person to not kill her?
4. Are there still factors that have been overlooked (for example, I'd still like to know why Okabe has the ability to retain all his memories from any alternate timeline he's been in and what triggered it the first time).
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