Warcury is the only one if you stripped away his regen on Egghead, still comes out with the best durability feats in the entire verse, above Kaidou. The same attacks that were flooring Kaidou, were literally hurting Luffy, I don't think you've quite grasped how ridiculous that is.
Each and every single other gorosei was a regen merchant that arc, they aren't the best anything compared to any other top tiers. That alone has separated him from the rest.