Unless actually stated, fight scenes in movies are non canon. We have Zoro fighting Fuji in the manga and in the movie but you won't see people using the non canon movie as the scale for Zoro. Even then, it is stated that Kizaru and Fuji backed out because of the civilians so it is not even comparable to Greenbull's situation
Point out what is disingenuous about saying the OG trio has better feats and portrayal to the new Admirals (at least in the case of Aramaki) because;
1. Kizaru did not take damage from Marco. Kizaru fought with WB and damaged WB. Kizaru was willing to engage with Big Mom or Kaido.
2. Aramaki took damage from Yamato and Momo. Aramaki run away from Shanks.
Only because one illogical movie feat happens doesn't mean everything is automatically non canon as well. Look how Momousagi and Chaton were introduced in a movie. And what's wrong about Zoro fighting Fujitora? Mihawk appeared in the movie and demonstrated the actual gap between him and Zoro when he effortlessly cut the huge meteor in tiny pieces which Zoro struggled to cut in the movie. Kizaru and Fujitora also backed out when they sensed Shanks' CoC.
It is disingenuous to point out ones best feats whilst highlighting another ones worst feats, that's the issue here which you purposely deny. And it is also disingenuous to merely look at feats while they all are admirals for a reason. The navy had 2 admiral candidates but they didn't make it, instead Fujitora and Greenbull made it, who recently joined the navy.
1.) Again, Marco vs Kizaru was 1vs1 and Kizaru needed a distraction + a Vice Admiral to win the battle according to feats. Greenbull had no support and whooped King and Queen.
2.) Yamato injured Kaido and held him off for 30 minutes. Greenbull was injured by Dragon Momo and we do not even exactly know the actual injury. Again, jumping on conclusions that soon is not rational.