Super Neo Metal casually blitzing Sonic and Knuckles at the same time, and about the list you showed earlier
massive outlier, unless you seriously want to argue that Classic Knuckles is immeasurable in speed, good luck backing that up
what is accepted is it reaching to where the battle took place, the whole gimick of the fight is Sonic amping Eggman's Eggmobile to fire at Gemerl, so that already disqualifies as a base form level feat
you mean when Modern Sonic has consistent feats of growing to the level of the super forms of his past? yeah, what of it? this doesn't prove that Super Forms don't boost speed too much, it proves that Sonic grew that much
Classic needed the emeralds to fight Phantom King, and the Death Egg Robot in forces......go to the point above really
by a surprise attack, where moments prior he utterly blitzed and dominated both Sonic and Knuckles at the same time, at best it is an outlier for Shadow
what about the Time Eater?
Giganto literally blitzed Sonic to grab him in their first encounter, where Sonic couldn't do anything to not get caught, so no
you mean when none of the said projectiles where hitting them in the first place? yeah ok
Super Forms grow alongside the user, him having greater feats wouldn't make the gap between them smaller, it would remain the same