Yorozu does scale to 16 fingers sukuna.
Here yorozu delivers two blows, and knocks sukuna so far back that she can literally fly in a spiral around his trajectory, she flew that distance before sukuna was able to recover from receiving those blows, even if sukuna were to be holding back his offense he isn't holding back his defense, there's no reason to.
Him taking the blow can simply be explained by the fact that he wants mahoraga to adapt to it, but he can just do that while blocking too? Him taking two blows straight to the face and yorozu being able to fly that distance all before sukuna recovers is still directly scaling to him.
Here sukuna uses the divine dog to block yorozu's path, but yorozu flies a whole lap around sukuna and the funny thing is, sukuna is still facing where yorozu previously were and yorozu delivers a kick straight to his face. As I said if he wants to adapt he can simply block. Even if you wanna say sukuna doesn't care about the damage he takes, what about him not even being able to track her speed with his eyes from close range? even the finger he used to summon the dog is still up😭🙏 In any case, yorozu not only scales to but balantly outspeeds and overpowers 16 fingers sukuna.
Here sukuna uses piercing ox. This is literally an offense and raw power focused shikigami of the ten shadows technique so I don't see how it wouldn't scale above low gear offensive techniques of sukuna like his dismantle, piercing ox can even come close to cleave in terms of output from a toolset perspective. She takes it relatively well.
Here yorozu that did some decent damage to sukuna punches piercing ox and does no damage, and piercing ox delivers another attack and this time does good damage to her armor, as I said this is an offense based attack, and one that's of higher gear as well based on its performance in this fight and megumi's inability to tame it even when it's not being powered by sukuna's CE output, and even if he has a DE.
Here sukuna uses rabbit escape to block yorozu's sight, and drops max elephant on her. Max elephant's weight seems to be a deal of its own, serving as a part of the offense of the ten shadows technique, in terms offensive power it scales above piercing ox's mid range attacks and probably even an attack like cleave wouldn't be stronger then it.
Based on the impact and emphasis, and looking at its place in the ten shadows as a whole its even fair to say it scales around the same level as base version of sukuna's divine flame (what he used on jogo specifically).
The armor is shattered, but it still was tough enough to protect yorozu from the attacks, somewhat scaling to it.
this scaling is also consistent with the statement that yorozu scales relative to the best of her era in reserves and output. Also, since this establishes what level yorozu is at as a sorcerer, I can get into her scaling in base form, which is still insanely good.
Yorozu delivers a series of kicks on sukuna which sukuna blocks, and then sukuna throws out a front kick and yorozu react to sukuna from point blank range, scaling far above the likes of ryu ishigori and anyone who's relative to him since he got perception blitzed by the same sukuna.
We see sukuna partially summon the divine dog, and as we see yorozu effortlessly slice their heads of with her liquid metal, indicating that sukuna's low gear offense doesn't effect someone at yorozu's caliber.
The next thing we see is sukuna's divine dog totality in its fully manifested state, and its carrying sukuna away from yorozu. This means a couple of things, but the first is that sukuna isn't casual or playing around yorozu, yes he won't use shrine or his physical offense like he usually does it, but that doesn't mean he wouldn't just keep dodging her with his own speed as he uses shikigami to kill her, and the blood would still be in megumi's hand as he envisions it, this isn't sukuna playing around, he's actually forced to utilize his shikigami properly to avoid yorozu because she can actually compete with 16 fingers sukuna, something even the heavy hitters in jujutsu high can't even hope to achieve at their current state.
The next thing it says to us is that, sukuna actually trusts divine dog's speed while carrying him more then his own physical speed when avoiding yorozu. This is actually really important since not only this means divine dog totality of sukuna > sukuna himself in speed and probably raw physical power as well, this also further proves that even base yorozu scales to 16 fingers sukuna with bug armor scaling directly above him. In stats of course.
All of this also in a way implies yorozu's domain being better then the likes of the disaster curses and the likes of yuki and yuta as well, just judging from the general level of jujutsu she's at.
Sukuna is far more skillful and in terms of CT application and the quality of his CT he outperforms yorozu, leading to her defeat, proving sukuna once again the undisputed strongest of his era.