This is not even I have a problem with. But then there are multiple universes, Various Versions at the same time etc. This shit is sooo fucking confusing^^In american comics, we have legacy characters. The Flash was originally Barry Allenm.. but the Mantle of The Flash was passed to Wally West. He actually became the fastest version of The Flash because he mainlines the Speed Force. This actually stayed cannon for over 20 years until Barry came back from the dead.
Any of the Robins can take up the Mantle of Batman (Damian Wayne, the current Robin actually did in an alternative timeline where everyone was infected with the Anti-life equation).
So can one of the Superboys (yes, Jon Kent, the son of Superman, and Connor Kent, the clone of Superman, are both Superboy in the current timeline).
Just like Sam Wilson was bestowed the mantle of Captain America when Steve Rogers was killed (but the govt didn't want a black Captain America).
Legacy characters are a big thing in comics...