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

[1eyedking]

Simon-3 came into physical existence after Simon-2, which means all actions prior to his creation could only have been a recollection of memories.

Let me explain. Simon-3 never exerted his will prior to the moment he was created. That is, he remembers and believes he did, but actually did not. The Simon that physically pressed the buttons and inserted the chip, gel and battery that lead to the third version's creation was actually Simon-2, of which we had total control.

If we had been Simon-3 from the beginning, we would only have had the chance to act out all the happenings from the Power Suit onward. Given that we play through all stances of Simon - that is, we exercise full will and control - I would say the perspectives are from all of them.

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I guess it depends on how you look at it.

If you consider player actions a happening continuum, which is how we actually feel while playing the game, then what I said holds true. This is in consonance with what I believe the devs intended, because not only did they want us to feel pity for Simon-2, but otherwise we would have never gotten the chance to live out Simon-4.

That said, if you consider player actions as some sort of live retelling (and write off the Simon-4 as an added spin-off), then yes, we were Simon-3 all along. It does go against narrative purposes, though.