- Volume 18
Actually, I was talking about Feldway not scaling to Ivarage, but there are statements for Guy scaling to pre-awakened Ivarage—even Milim too. But yes, if the pre-awakened Ivarage feat is just destroying the world over time, then that wouldn’t be Low 2-C.
Regarding current Ivarage scaling, like you said, it's better to wait for Volume 23. But I should mention this beforehand: I don't mind if Guy and Milim end up in Tier 2 because of Ivarage scaling, but let's not scale just anyone and everyone simply because they fought Ivarage. I think it should be handled on a case-by-case basis.
That said, since Rimuru has Turn Null and Tier 2 AP from Volume 21 onwards because it TN, I'm not opposed to Tier 2 scaling from him to other characters. It's just that having Tier 2 AP doesn't mean every character he fights should also be Tier 2.
For example, Rimuru mentions that it would have been easier to use brute force to cancel out the full-powered Dragon Nova Milim fired in Volume 22, but we later learn that it was Ciel who intentionally took the attack and didn't use Turn Null to defend. So it actually caused damage. I think this scenario doesn't mean Milim’s AP scales to Rimuru, who scales to Tier 2 via Turn Null.
I'm just giving an example of cases where Rimuru might not be operating at Tier 2 when fighting weaker characters than his current self.