One of these big changes this past season was the identity of the first speedster, Jay Garrick.
For instance, the original backdoor pilot script featured Harley Rathaway (Pied Piper) as a member of Team Flash.
Jay (played by Teddy Sears) was introduced as a fellow speedster in the premiere, but we later learned he was actually the villainous Hunter Zolomon, aka Zoom.
It’s more likely that after introducing Barry in Arrow and scrapping the backdoor pilot, all the characters on the upcoming series were changed.