Post Crisis on Infinite Earths, on an episode of the Flash, The Ray is mentioned to be on Earth Prime. He and Leo Snart (Citizen Cold) from Earth X were engaged last we saw Leo. Is Leo on Earth Prime or was it made that Leo and Ray never met and got engaged?
I think that it could be similar to the Laurel Lance situation where Earth 2 Laurel is alive and currently on Earth Prime while Earth 1 Laurel still existed and is in everyone’s memories. Captain Cold is dead so Leo could be alive.