I'm not sure Luffy had base super-strength and body. He spent years training with Ace and Sabo after all.
All Luffy did was do Sparing matches, devil fruit control and survival training is not the same real professional training.
Like strength training, martial arts and Swordsmanship.
Sanji, Zoro, Sabo, Garp, Coby all have proffesional strengh training and martial arts/ Swordsmanship training.
Luffy never once had any proffesional training. He is mostly self taught.
Luffy has never done base physical strength trainimg in his life until wano.
There is a reason why Luffy has all these haki and will have the strongest haki in all 3 catagorys.
It is becuase he never had any formal training, has no fighting style and relies soley on devil fruit and haki.
Luffy like Oden and Big Mom have relied on their natural genetic physical strength without any base training.