Sonic technically has one 2-C feat and that's from the Egg Wizard.
Solaris phase 1 should be low 2-C, we was taking a while to destroy one space time and the light shells were said to be anchoring him. It makes sense because when Solaris becomes phase 2 he's much stronger and no longer needs the armor, if he did then he'd just have a new set. It's quite simple, phase 1 is low 2-C and phase 2 is 2-C. However this doesn't mean the hedgehogs jump tiers in battle, not only would it make no sense but for the rest of the battle they only attack his weak spot.
Really, now you're saying Solaris's core has Low 2-C durability? The reasoning for this is heavily fallacious, Solaris would consume all timelines and dimensions, he is 2-C, simple as that.
Next is the feat from Sonic Rush, I don't get why it's so hard to understand that this fear in particular is low 2-C. Two strong forces were taking a while to destroy two universes, the chaos emeralds were destroying one universe and the sol emeralds were destroying the other.
Wrong, the Sol Emeralds were causing both Sonic's and Blaze's universes to merge. That is again, 2-C.
I'm gonna be pretty blunt for a sec. The profiles for Sonic characters are quite bias and makes no sense. Sonic should not have a variable tier because of the "Turn Thoughts into Power" thing. It's quite fallacious to really on that when the chaos emeralds have shown limits. Super forms have shown time and time again that they require help for some bosses. If the chaos emeralds truly matched the power of their opponents then only one would be necessary. There's also nothing wrong with two tiers with a huge gap between each other, fleet way Sonic is 5-A and 2-C, why can't this be the case with Game Sonic? My point on the scaling is there are only 2-C statements and low 2-C feats (for god sake there are 3 of them)
Having help doesn't negate scaling. You still need 2-C AP to physically harm a 2-C.