Wow! Look at the conversation that happened without me!
I just remembered something about the SV JL that I never understood. Was there a specific reason why they only ever called Bart Impulse, and never The Flash? I was looking at his comic bio and I see that he was appeared to have a fairly short career as The Flash, but he was as far as I know the only Flash in SV, so I would think it would make more sense to call him that, especially since it is much more recognizable than Impulse.
I think David Goyer was preparing a Flash
movie starring Ryan Reynolds at that time so DC put an embargo on the name. Of course Goyer's movie fell through so there's no reason not
to rename him Flash