So, i said that base Sonic should not scale to Low 2-C until Secret Rings. As to not derail the profile split thread, I'll explain why here.
The only reason Sonic 06 currently has Low 2-C scaling is because these scans presumably imply that Eggman's mechs in that game are stronger than all his previous ones, including the Super Egg Robot:
https://imgur.com/gallery/nKFyNT1
However, all the scans say is that these are some of his most terrifying creations. Nothing even implies they're this powerful, impressive, or advanced. They're just "scary". Statements that actually hype up an Eggman creation as being being superior to the Super Egg Robot would not appear until the Egg Dragoon in Unleashed and the Nega Wisp armor in Unleashed and Colors respectively.
So Sonic should stay 4-A until SR.
After SR, he scales to Low 2-C, but still isn't on par with his Adventure era Super form.
His Werehog form, on the other hand, would be, as would his base form after Colors (only further cemented by Generations).