Board Thread:Policies/@comment-1038387-20160526205522/@comment-27091422-20160527121044

Remember, though, that Barry was brought back, Johns changed the character quite a bit to fit the New Earth continuity. In the Pre-Crisis timeline, his mother hadn't been killed by Reverse Flash and he had an entirely different life before his career as Flash. Also note that Barry and Eobard are two characters that have been time anomalies for a while now, starting way back with the time Eobard killed Iris, and I wouldn't be surprised if the reason Barry remembers Wally has little more explanation than "they're connected to the Speed Force", and him meeting Wally is what sparks his memory of the Pre-Flashpoint timeline.