I think people over thinking the speed thing other than Barry and Wally everyone does not matter.Here is why in real life Usain Bolt and Justin Gatlin are obviously faster than everyone but just a second which is enough to be clearly faster .
Everyone else is half seconds slow than each other which makes the topic of their speed a wash they are all general on the same level. Only Barry and Wally are in a different tier of speed meaning they are only two expected to put separation between themselves in a contest of speed.
If Superman and Shazan race and Superman slightly wins that is expected. If Wally and Barry race Shazam you don't expect it to be close . It is nice to have a list of speed something more tiered would have been more useful.