If there are now 52 earths to work with, what's the harm in placing ASS Superman in a universe of his own, just like KINGDOM COME got its own world?
There are several occasions where ASS contradicts Earth-1 history, and thus it would be smarter to keep it as its own world.
In the past I've said that everything Byrne did could have been done in the regular Earth One continuity. The one major problem with this, though, is Ma and Pa still alive. But death is hardly an obstacle in the DC realm.
Hmmm, interesting idea.
One thing that especially makes sense with this idea is the "falling out" between Batman and Superman. In fact, if you look at Pre-Crisis comics, you see several events that made the decline of the Batman/Superman frienship inevitable. In fact, there's signs that is precisely where DC intended to go, long, LONG before Crisis, Byrne and Helfer and the rest:
For instance, Batman leaving the JLA and forming the Outsiders. The reason Batman left the JLA was because more and more, he wasn't seeing eye to eye with that organization. This had become a part of his character since the late seventies/early eighties.
The "definitive" end of the Batman/Superman friendship might have been the death of Jason Todd (the timeline in MAN OF STEEL is so vague that conceivably their "team-up" could go anywhere in the characters' history...which is what Byrne intended). Here you had a situation where the Joker
killed Robin, but Superman defended the Joker because of the Man of Steel's belief in the rule of law and diplomatic immunity.
Under those circumstances,
I wouldn't be Superman's friend after that either. If Batman and Superman had a falling out (that led to the Batman/Superman story in MOS) it would be perfectly understandable.
As for the Kents, if Ma and Pa Kent can have their youth restored, other things are possible. Perhaps their resurrection was a hitherto unknown side effect of the youth treatment.
Lex was smart enough to clear himself of all criminal charges anyways (if a normal human can get OJ cleared hypermegasuper genius lex could get himself out of jail).
That makes sense. It makes sense also that the world's smartest man would also be the world's richest. I always liked that addition to the character of Lex Luthor, and I was especially pleased by Mark Waid, who had a solution that both kept this addition and reconciled it past elements of the character that were in retrospect, done away with.