might as well present my view on the matter, i think invulnerability should stay simply because high durability creates contradictions within the franchise, such as with characters like perfect chaos and the 4 titans, where even when they are all powered up by the same thing as sonic, they can't harm him, but he can harm them, if the emerald give a boost in defense so much higher than attack, then why can sonic harm them but not the contrary? this is even more apparent with dark gaia, his tentacles can harm super sonic by physically striking him, which by newtons 3th law would make them scale to super sonic in durability, but then sonic can harm them no problem, even when characters powered up by the same power source as him, and thus comparable, can't harm him, even with metal overlord, which is stated stronger than the emeralds, couldn't harm super sonic, and then there is the eggsalamander and eggwizard situation, the eggsalamander can harm super sonic with it's missiles, but the canonically stronger eggwizard can't, which wouldn't make sense if it was a mere factor of defense, so i disagree with the crt