The entire game is actually from Simon-3's perspective (spoilers!)

[cantremember]

The way I see it, the entire game is played from Simon-3's perspective, and potentially everything up till the point where you are in the deep pressure suit could be a flashback/memory.

When you are scanned and copied, nothing happens to you. But an alternate copy is created who perceives being jumped in a new body, because he shares the same mind/memory as the original.

If you were the original Simon, you would just go home after Munshi's scan and lived on till you died of head trauma.
If you were Simon-2 then you would be the one being left behind before the abyss.

On the other hand, the fact that you are actually playing as original Simon before his scan is taken, unless it's intended as a flashback, means that there is no other way than to lose the "coin toss", but strangely, it exactly plays out the way Simon (or one of his btanches) would experience his life, so it's not necessarily in flashback form either. Simon-2 and -3 would not have physically done anything of what their predecessor did, but the course of their life really would entail being in Toronto and jumping to a different body etc.. It's hard to really explain what I mean, but what would you do if you were Simon 3 at the end of the game ?