@Cal, the problem with OBD's was Merlina's feat was not considered legit; as I heard she never created a pocket Reality by simply warped Camelot. Anyway, please avoid talking about other websites.
Anyway, the variable for Chaos Emeralds varying from 5-A to 2-C was already decided to be legit. The only thing we're discussing is whether or not Solaris's 2-B upgrade scales to the Hedgehogs. Which my stance is still pretty much the same, I heavily disagree with Immeasurable speed due to the blatantly obvious inconsistencies, but am more neutral on the 2-B tier for the hedgehogs.
Now I here from both sides, Solaris was the only true instance of the Chaos Emeralds awakening 100% of their positive energy. So it can make sense for them to be 2-B, but I personally think Zamasu's reasoning are underappreciated; though I understand some things he says here and there sound iffy, but at least he's fairly open-minded. Solaris destroying "All Existence" is only mentioned in general mentioned; not regarding any of his specific forms. It's unknown if it refers too all his forms, or just his best form, but it is true that Solaris was nerfed in their fight against the Hedgehogs. That being said, no one's arguing that his final form isn't 2-B.
Another note, not sure who said this, but someone on another thread a while back mentioned some lore about the Chaos Emeralds serving as Solaris's kryptonite rather than an actual toe to toe fight. The Hedgehogs taking hits from Solaris may or may not be game mechanics and same thing could be said about the core weak spot. I'll point out weak points are case by case around here; it really depends on how it works, the portrayal if you exclude the weak point, and/or what the lore states.
If you take Link or Mario for example, the weak points are game mechanics since there are bosses that don't have weak points and, even ones that can only be harmed via weak points in gameplay are shown to be out muscled by Link or Mario respectively. But Sonic and the others are portrayed as flies getting swatted away by a grizzly bear whenever they clash or aim for spots that aren't the core.