User blog comment:IHHeroes/Changes going forward after Crisis/@comment-28904959-20200116043907/@comment-26447726-20200116045325

The old multiverse was literally destroyed along with all of its inhabitants. It just so happened that when the multiverse was recreated from scratch, the events (the particle accelerator explosion, the landing of the Kryptonian pods on Earth, the use of Green Light on humans, etc.) all coincided on Earth-Prime. No one was brought back. There is no merge if there were no Earths to merge in the first place because of the antimatter. Every version of everyone and everything is new.