I don't know that it's all that unique. Tifa's friend Cloud... I can't claim to know him well, but I don't think the one that was here before and died is the same one that is here now. At the very least he seems to be from a different point in their timeline, a future point. He doesn't remember being here any more than Peggy back home did. ...I'd be cautious asking Tifa about it, she didn't seem comfortable confronting the idea when I brought it up.

...When one is aware...?

No, I... don't think I thought it was. Like I said, just trying to figure out what about our situation you found especially interesting. And I guess also wondering what's got you interested in the subject in general. ...Speaking as someone who has spent a lot of time pondering the subject in general and specifically related to myself, even before Peggy showed up and added another piece to the puzzle.