Fujitora was not super casual, what are you on about lol? What does attack being nameless had to do with attack being casual, Zoro's Pica slash was nameless but "Bird dance" attack he used on Hody was named, does it mean that Hody attack was stronger than a mountain buster?
Dude had intensity all over his face and used one of his strongest attacks that he had in Dressrosa,
On top of it he stayed on Zoro kept applying insane pressure with the attack so strong, it had same level of DC implying same level of power as Diced Mochi, Katakuri's strongest attack and Zoro overpowers it with a nameless flying slash from his weakest sword.
Fujitora lifting rubble was nameless, him summoning meteors was nameless.
Raging Tiger Fuji used on Luffy > Attack Fuji used on Zoro >> Raging Tiger Fuji used on Sabo.
The only difference is Zoro tanked that attack from Fuji and then physically overpowered it while Luffy only survived the attack due to his resistance to blunt damage and Sabo due to his logia abilities.
But the most important thing is Zoro was able to OVERPOWER a top tier's attack. Zoro is the only non top tier character in manga to overpower a top tier's attack while top tier is clearly trying to restrain Zoro. That feat alone is enough to put Zoro at YC1 level.
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And Luffy doing better than Zoro also makes negative sense because Zoro has fought Fuji before and Zoro saw what Fuji did to Luffy and Zoro still wanted to see how he would fare.