As it turns out, the Flash was right. The man removing his mask in the prologue to “Chain Lightning” wasn’t who Wally thought he was at first. But Cobalt Blue certainly looked like the classic Scarlet Speedster! (Flash v.2 #144, 1999).
Interestingly enough, the series returned to the cover concept less than a year later during the Dark Flash saga, reversing the lighting, the angle…and who was doing unmasking. (Flash v.2 #154, 1999)
(Thanks to comics.org for the covers!)