I'll say Plutonian as well. I am only fmailiar with him through his scans though, so everything was pretty high end it seemed, but his high end feats seem to trump Bill's high end.
What he meant is, the scientist inferred that Plutonian wasn't so much a real person as he was an idea given form. He shattered his essence into countless alternate dimensions and universes until someone could make him again, but the right way. And the two kids who found him I believe were the two guys who created Superman.
Well yeah. If you look at the powers Plutonian has access to, he's basically one of the most powerful people short of full blown reality warpers. He could probably have figured out how to do that with enough time if he hadn't been broken down.
It was actually the creators of Superman, that were shown. The creators of Supes as a comic book character. So, actually, it is saying that one of those "echoes" of Plutonian only managed to cause 2 writers to create the fictional concept of Superman.
This scratches my statement about the fraction of Plutonian becoming Superman.
It only became the "idea" of Superman.
But, damn, it definitely leaves a lot of material for future writing.