Excuses =/= Facts
Sanji isnt working like he usually do, its something comoletely new for him, simple as that, the fact that the spoilers made it clear he is feeling "umconfortable" means it has something to do with the fight, even Zoro noticed that, and Sanji isn't just asking mercy from Zoro, "carry me in the fight im not feeling gud".
Why would this even be mentioned if Sanji is supposed to be feeling completely fine and boosted while fighting? Oda could literally forgot like it made no difference, but he didn't
Giving Yoru for Sanji doesn't make him comparable to Mihawk either, because he was never a good swordsman to begin with.