Probably, but they're more prone to damage from blunt attacks than Luffy. They can't dodge as much and they can't evade or defend as much meaning they're gonna get damaged much more on average than Luffy.
That is complete nonsense. Something like this was never implied. Luffy didn't have any ability that works around FS. Luffy's only plan to beat Katakuri was by achieving FS, which he did. He would've lost if it weren't for that. Hell, he'd have lost if Merenda episode didn't happen even if he awakened FS.
I am not even sure what that means. Their reactions don't suggest anything of that sort. Luffy's reactions are miles ahead of Law. Read Dressrossa.
I'd agree that it takes a lot of effort to put them down. But Kuri is winning this. If there is one YC1 that they have a 0 chance at beating, it'd be Katakuri.