Mihawk don't need "upscaling" , it's not even an upscale just because you know someone should be able to do something better, their strength is fixed. I know people do it to say "well Mihawk is atleast better than this" like Divine departure n shit, but even that is a pathetic comparison because Divine departure is just a level 1 move essentially anyway.
I mean lets say Scopper blocks an acoc attack, are you gonna use that to say Ray can block it even easier? how do you know that? Scopper could have more raw strength than ray to rely on to block the attack. They can have different strengths. Ray might be more skilled where Scopper is like the burgess of their trio.
But Ray has been retired this whole time and is rusty, he said so himself, hadn't used his sword in a long time, whereas someone like Garp has continually been in active service despite his old age.
Copper doesn't rust over time. For all we know Scopper could have been more active than Ray all this time, keeping himself sharp, maybe even keeping up with training all this time. If that's the case Scopper might even be stronger than Rayleigh right now (not even might, he defo would be). Ray being retired while Scopper is essentially acting as a guardian of Elbaph or some shit.
What was that quote of the explorer when it showed that sillhouette? to not stay in elbaph for too long? isn't that exactly what Gaban has been doing?
So no, you can't use whatever scopper does to upscale Ray, especially if you're ignoring potential context.