There's the possibility it could change a lot of things, yeah.

[ Which is why he prefers not to risk it. ]

That one I'm sure he can do, though - bringing people back without changing things. I'd died about....two or three years before the Admiral approached me in, uh...my world's version of what comes after. I went back home a little while ago, after I got my life back, and...well, there were some really awkward and emotional conversations. Because I was dead, you know? Everybody who remembered me knew that.

So that part of the timeline didn't change. I just didn't stay dead.