User blog comment:ReverseZoom101/Things You Might Have Missed In The Flash-Trajectory/@comment-27700324-20160323192443

1. No i am pretty sure he was not in Central city around the time of the particle accelerator explosion

2. The Opal city from Supergirl is on her earth, so unless Adam always goes there in other worlds, then she couldn't have a mini Supergirl crossover.