asearcher said:
Part of the problem for QL is that is seems that the project flows along the Quantum Forking with the changes Sam makes. As you indicated, in a parallel timeline, Al (being an observer in the original timeline) not the rest of the project would not experience the changes that Sam made. Thus the entire theory that "fixing things" will bring him home is a flawed hypothesis. In a parallel universe theory of time travel, Sam can NEVER come home to the original timeline. Additionally, if the changes are taking place in a parallel universe then Sam really isn't setting right what once went wrong. Rather, he would be constantly creating new quantum forks that have NO relationship to what went on in any of the timeline that he has existed in before. Those wrongs will still be wrongs in the original timeline they occurred in. Since Al and the rest of the project experience the changes as Sam makes them, then somehow the project is also following Sam through the parallel universe and that concept is a paradox in it's own realm.
Technically speaking, you're absolutely right. It's also very possible that even Sam, Al and the Project have a misinterpretation of time as well. After all, they do spend the whole series asking more questions than stating answers regarding how to get home, what the "unknown force" is leaping Sam around, etc. As much as it is a cop-out, the swiss cheese effect could be referred to here as well.
So by this line of reasoning, technically "putting right what once went wrong" isn't actually what's going on, as you said, Helen. It's more like the "next best thing," if you will. Every new timeline that Sam creates becomes the new "home." I believe if Sam were to travel back to this new present, he would find his brother Tom alive, yet have no recollection whatsoever of the history that occurred since April 8, 1970── because he was never there to experience it. He would belong there as the "frozen river" theory states, however. So, although this would mean that there is still an original history out there where what went wrong will always remain wrong, Sam and Al will never get back to that reality. But I really don't think that's a bad thing. For all we know, the final statement of "Mirror Image" could mean that it is just another wrong to put right, or move to a universe where it's made right, via the time branch.
I know that it doesn't seem like how it was meant to be, but this is really the only way that I can see how Sam, Al and Ziggy can be aware of all original histories. They're all connected via brainwave connection, thus, they are all a part of each other in some way. We don't know for certain whether the rest of the Project is aware of the original histories (as far as I can remember), but I'm betting that they aren't. The Project, along with the rest of the world for that matter, would never be aware of this original history/parallel universe, because they never departed the one they live in. From their points of view, Sam came along the first and only time and those tragedies never occurred.
Infinity is a common variable no matter what theory of time you believe in. If we are to believe that time is how the series implies it to be, that would mean that there is one universe with infinite "layers" of time, for lack of a better word. With every leap, Sam is supposed to enter one of these infinite layers and change it. The fact that he can even travel into the past in the first place would be proof that there are these infinite layers. Now, the problem here is that you would have the anomaly of Sam. The one we see throughout the series comes from the original timeline where things went wrong, but in subsequent layers of time, there is a Sam who grew up with Tom alive and who would be happier. It's more psychologically satisfying for me to believe that Sam simply moves to another parallel universe without even realizing it, and thus is not an anomaly. The irony here is that everybody in the new parallel universe (if they were able to see Sam for who he is) would see him as an anomaly. In actuality, he would not be, and will have belonged there all along as part of the frozen river.
So, it seems that either there are infinite layers of time and one single universe, or there are infinite parallel universes which are all frozen. While the idea of infinity may sound extremely farfetched, the way I see it, it's not that absurd.
EDIT: I'd also like to briefly add my theory on "Mirror Image," which is that Al's Place and the reality it exists in is another one of these parallel universes. Perhaps it even exists due to changes Sam has made. For instance, as I was stating above, there'd be a universe where what went wrong stays wrong, and another universe where Sam was there to make things right and so on. There's the timeline where Tom was killed, and therefore would not live out his life and presumably get married at some point and/or have kids, hypothetically speaking. Therefore, you have people who exist in a timeline that never existed in another. Al's Place could have been a radical extrapolation of various outcomes like these among these parallel universes.
In this alternate 1953, there would be things that could go wrong just like in any other leap (Tonchi and Pete needing to be rescued from the mine, etc.). It's my belief that in this version of 1953, there is no Frank or Jimmy LaMotta── only a Tonchi and Pete. And the same would go for any of the other "doubles" of people Sam had helped. After all, it wouldn't make sense in our world that there could be multiple versions of the same people in different times with different identities. Or, rather than being a radical extrapolation of other realities, I've also theorized that it could be another dimension altogether. The idea that these outcomes are infinite truly allows ANYTHING and EVERYTHING to potentially be different, even in the slightest way.