The truth is
1. Aside from Yamao, GB was also fighting: adult Momo, Denjiro, Inuarashi, Nekomamushi, Kawamatsu, Raizo, Shinobu. So beside Yamao, GB still needs to divide his attention to 7 fighters and none of them are fodders
2. Yamao has been healed, has eating after Luffy woke up, had her kanabo. Only thing she didn't use is her devil fruit, but she didn't use it not because she held back but because she was already negged before getting the chance to use it.
So despite GB was nerfed by focusing on 8 opponents at once while Yamao wasn't nerfed at all, still all it takes was only short Robin scene for GB to offpanel and negs her.
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Is that supposed to be a new thing?
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Yonko Kaido called dukes strong.
Yonko Luffy called Okiku strong.
Admiral Greenbull called Yamao's haki strong.
Yonkos acknowledging scabbards' strength has been consistent portrayal.