Actually, I tend to think of "The Fifth Act" as more of a time-travel fix-it than Sephiroth habilitation. It's not about giving Sephiroth another chance at life (indeed, for most of the story, it's about rather the opposite); it's about Cloud fixing his self-perceived mistakes. Whereas for these, the focus is much more on Sephiroth, and how he's changed/changing to be a different person.

I agree "The Fifth Act" is worth reading, just that it's not quite what I'd slot into this particular sub-genre.