User blog comment:Xandermcc/Black Lightning confirmed?/@comment-26618197-20170724113534/@comment-24152851-20170725034611

@Steven, they'll probably end up doing it so only the core heroes like Oliver, Barry, Kara, Sara, and Ray are the ones to retain their memories. They'll be the ones at the dawn of time (or wherever Arrowverse picks) when the universes merge.