Can we please not misconstrue what the story is telling us.Nah, just stating what he said. You want to check SBS on what he said if your that confident?
I mean still difference is the uses on them as Enma is stated having it's own abilities and mind of it's own, so hard to say if that was skill or power of sword while RS it doesn't increase your power as his power is still his own or are you thinking 'invisibility' does when never been stated. Sanji still fighting with same Black Leg style and it's a feat on him for blocking attack and tanking it.
It does in those hints as you would think he is resistance more to attack given his body, but isn't as much. I can see fire being harmful to him on his side.
Just because you love Sanji does not mean you have to downplay Zoro at every attempt (and the same thing goes vice versa).
Enma has been stated to draw out excessive amounts of Ryou from its user, and this is specifically why Zoro spent time pre-onigashima learning to control it so it wouldn't sap his Haki. It has been made extremely evident that Zoro is actively controlling his power output while using Enma, now bear in mind without Zoro's haki, Enma is essentially a useless weapon.
Regarding Sanji, the raid suit does increase his base stats; let's not act like it doesn't. He's stronger, faster, stealthier and more durable while using it; however, I don't see why we see this as a take away from Sanji. It's all about how Sanji utilises it. In the hands of someone weaker than Sanji, the Raidsuit would not have much value. Sanji himself has implied that without the Raidsuit, he would have taken much more damage from the likes of King.
Can you please show us where there are hints of Kaido being less resistant to fire in the manga?