Walex on page 535
Actually Sam needs to die too, since he is adult Charlie in this timeline.
If he continues to live this timeline will become the war hell from which Rothwell comes.
Things here become complicated a bit: the presence of both young and adult versions of the same person in the same timeline causes a lot of logic trouble:
* If the young version dies, "something" triggers EOS to build MEMNON, and then he wipes out humanity.
* If the adult version lives, "somehow" endless wars are the result, and a final virus is released (and I suspect that EOS is still involved as she runs an advanced biology lab).
What a gigantic whorl-up! :-)
PS What happens to the original timeline from which Charlie was pulled? Since there is no Charlie in that timeline, he cannot be killed, but also there is no adult Sam, so the endless wars don't start.

Tominalbany on page 535
Part of me wants to go back and read from the beginning. Most of me doesn't have the time...

Opus the Poet on page 535
I think it has been established that Sam is not the same person as Charley. Wrong timeline.