Ryukama said:
Like others have said, nothing significant took place after 2006. Feats of similar nature just happened to occur during that time. There's no reason (other than of course plot) for Super Sonic of 2006 to be vastly superior to Super Sonic of of the 90s.
Also I don't think Sonic 06 should be counted either case, since even if the other Low 2-C feats now become considered, Solaris's tier (2-C to 2-B) is far greater than the other ones. We've established to gap between Low 2-C and 2-C to be, while unquantifiable, extremely massive.
So in my opinion even if we were to consider Low 2-C Sonic, Solaris certainly just be an outlier as it massively contradicts everything else in the series.
And the defeat of Egg Wizard and Salamander can easily be seen as PIS, as it is fueled by a power source canonly far superior to the Chaos and Sol Emeralds like Crop said.
Emeralds do not grow stronger, but the characters become masters in using their power.
In Sonic Rush itself, Blaze had no knowledge of how to use the power of the Sol Emeralds, Sonic helped her learn to use that power by making her master the use of it. In fact, the emeralds were not stronger than in the past, but the characters learned to use more of their energy in a moment of history, with all the universal / multiversal responsibility that Sonic knows in Sonic Rush this can only occur after Sonic 2006 for coherence of feats.
Classifications in the franchise must be Beginners and Masters in relation to the use of the power of the emeralds based on what Sonic said, will not be all the characters that are going to be masters. The emeralds did not get any power up after 2006, but after that moment it was when Sonic learned to control their power.
And the other feats are Down 2-C to a minimum, it was not just a universe that would be destroyed in Sonic Rush, but the very fabric of reality itself, EggSallamander would not only create a new universe, but one that would transcend the other universes, TPoS no Was directed to only two universes, but directly to allow the existence of parallel universes.
I know it's about to end, but I had to show that there is a reason for the Super Forms to get stronger after Sonic 2006, characters like Sonic simply became masters at using that power. I wonder if this can be used to consider something.