Re: Let's say Marvel and DC were to merge universes.
They'd also have to reconcile there being a Green Lantern Corps and a Nova Corps.
I'd point out that the Nova Corps spends most of its time being destroyed or being in some stage of reconstruction, but the same is almost as true with the Green Lantern Corps.
So, maybe they'd have to reconcile that there is neither a Nova or a Green Lantern Corps.
“If at first you don't succeed, cheat, repeat until caught, then lie.” -Anomymous