I am definitely not stupid enough miss a simple logic such as this. Sanji clearly said that the doors can't be broken, after few pages Franky destroyed them like nothing. Not to mention that Zoro effortlessly destroyed a big ass iron door in same arc. Now I'll leaves the calculations up to you.
Ah yes, Franky>Sanji then as well.
And every door everywhere is the same strength?
Nah dude. If Zoro can cut mountains and Sanji can't knock down doors=Zoro easily and effortlessly beats Sanji, then Zoro can cut mountains and Whitebeard couldn't knock down a wall=Zoro easily and effortlessly beats Whitebeard.
The logic in both scenarios are the same, and you used it. It doesn't conveniently become stupid only when used against you, it was stupid when you used it to.
The problem is that the moment Zoro actually bothered use a big move to do that, he did it and defeated Pica under 2minutes, so how do you definite the difficulty in this case? Also, just to be clear, what do you think was the difficulty of the fight between Luffy, Usopp, Sanji versus Satori?
Still high diff because Zoro had to spent quite a bit of time(relatively) getting to the point where he used a big move and got Pica. Prior to that, he had a hard time catching Pica and figuring out where he was. The fight pushed Zoro maybe not mentally, but physically.
I hardly remember Sanji vs Satori.
Usopp vs Luffy was mid-diff. Even though the gap between Luffy and Usopp was extremely high, Luffy had some trouble getting him, but not as much trouble as Zoro did getting to Pica.