This, 100%. People looking to One Piece for power scaling are simply reading the wrong manga. One Piece isn't about that.
I mean, I love powerscaling, it's fun, but it can't apply to One Piece. The closest thing we could have is
a multidimensional powerweb
In One Piece, we can't be absolute. We would need to take into account:
- Is the character feeling well or is he in good shape ?
- Is the character has a negating power like Tama or Perona?
- How can both capacities interacts with each other? Fire/Ice - Electricity/Rubber
- Which character has the biggest "will" and the most to lose?
- What do Oda wants to tell in specific situations? (the situation is what will make the character the winner)
- Which character has the best strategic mind?
etc.
Storytelling through fighting system in One Piece is multidimensional it's not absolute. Devil fruit are here to enhance the fight and the thematic not be the decisive parameters.. so creating a powerscaling is almost impossible..
That's why One Piece's fights are so interesting.