>>149273956NTA but basically everything having to do with the speedforce and general Flash Mythos came from Wally's run.
Meanwhile the reason the term "Composite Flash" comes up in adaptation talk is that the jokey speedster that we see in things like the DCAU was Wally in personally under Barry's name and design on account of them trying to push Barry again at the time.
If not for the crew of guys who grew up in the 70s and forcibly tried to revert comics back to how they were when they were kids in response to the 90s state of things, Barry Allen would of been a footnote instead of being forcibly pushed, and having his successors feats and character dropped on top of him by the writers and editorial.