- Several stories Post-Crisis hinted that Kara's ghost wandered over New-Earth. What if she saw everything what happened between Linda and her younger self?
- Adding to that, what if she saw what happened to her best friend Barbara?
- Infinite Crisis came out less than two years after the end of Many Happy Returns. The four survivors of The Multiverse saw this story's events playing out. Earth-Two Superman watched how his Earth-One cousin -whom he owed his life- was ignored by Post-Crisis Superman and hurt and mistreated by other people -who were alive thanks to her- and the human girl who took up the Supergirl's mantle got screwed-up. Undoubtedly it cemented his belief that Earth could not be saved.
Fridge / Many Happy Returns