102 Votes in Poll
I honestly think Yu just swings his sword. He has shown proficiency but not anywhere close to Guren. If you are talking about power levels then that's a different story altogether.
Drawing on his demon's power, to his weapons magical based abilities (summoning a huge array of swords that are directed to a target is incredibly handy! Plus saved him from Noya), to the sword skills using the physical weapon itself, yes indeed Yu has proficiency. Yet it's a good point if he is second best to Guren (and whether that's a bad thing) but will that be the case soon? Yu's fighting skills also extend to how well he works with others, him and Mika work well together like no one else!
I would say Shikama is powerful and skilled, but his power is so great that even if he didn't have as much skill he could probably defeat anyone
So Shikama Doji may like to think, and it's something characters are increasingly taking advantage of - his assurance that he is all powerful and so becomes complacent to where Saito can fight him apparently evenly, and along with Guren have the means to seal him.
What do you think?