The one major problem with King, imo, is that his fight is rushed, he was shown to be strong, and then that's it, no proper named sword technique, after he removed his mask suddenly he's unable to go hybrid and using the Tempuraudon, Andon and any other attack, instead he's just standing there waiting to be sliced while spamming the fire dragon attack so that Oda can show us Zoro cutting dragon and move on to Luffy vs Kaido faster
same problem with the other all star, and the Tobiroppo, and probably with Big Mom as well
Katakuri on the other hand, got lots of time to properly shows his techniques, probably because he's fighting Luffy, although he got the crocodile treatment at the end