There are much bigger fish to fry in this world for Admirals to stand out in any way.
The order goes like this:
1 - Supreme hakimen
2 - Supreme DF merchants
3 - Hakimen
4 - DF merchants(this is where Admirals are)
Supreme hakimen are made of Zoro, Mihawk and Ryuma. Perhaps Shanks and Dragon, if not they are just Hakimen.
Supreme DF merchants are Blackbeard, Shiryu, Kaido, Imu and Joyboy.
Hakimen are Garp, Sengoku and other handful of the strongest people.
Admirals arent even the best among DF merchants, they are grouped into 2nd best type of Devil Fruits.
Mythical Zoans are supreme and then you have one or two characters with multiple DFs...
That’s a lot of headcanon to deny black blades being the epitome of swordsmanship, are we at a point where I need to remind you just how supreme swordsmanship is