Doriki isn't like DBZ PLs. It's physical strength. Kaku has swords, so even though his non-df Doriki is like half of Lucci's non-df, with swords he's probably closer, unless you think he's as strong swordless as with swords.
Arlong could quite easily lift wooden houses and throw them. Luffy pushed high-rise buildings apart just before heading to Enies Lobby, which looked like stone buildings. How much was this just physical strength and how much was also using his elastic properties to coil himself, in a way that isn't very transferable to other situations? In East Blue did Luffy already have the physical strength to lift a wooden house like fishmen could?
CP9 have great durability due to Tekkai. Is that a factor for doriki rating? Is Kalifla's rating 600+ because of her durability bringing it up, or because of her offensive strength?