To be fair, the biggest weapon of the Admirals getting nerfed in that position that they couldn't use their strongest foe. It is like Kaido and Big mom having not their strongest defense and must fighting in nerfed version(Big mom even did it when Jinbe clash with her). The same can be said by the Admirals, they strongest weapon are their attack power with their insane df power. Of course they could fightning it without using it much, but then they would fight in nerfed form.
The fight was sattle in MarieJoie, noway that Greenbull and Fujitora can fight all out their. It is more impressiv that they beat the Revos(with the current information).
As the Yonkous, the admirals get nerfed sometimes aswell. I see them still equal to Yonkous. I hope this gonna be showed soon when the Navy enter(even if Akainu say no, everything hint for a navy enter) wano.
In the past, two years ago, the admirals always could match yonkous or character in that league. It doesn't would make sense if Fujitora and Greenbull destroy this System of the powerhouse of the Navy.