False equivalence. Jack was considerably injured, but so were the Dukes being smashed by Kaido himself and later facing Gifters along with Jack.
Meanwhile Doffy's damage prior to awakening >>> Luffy's. Even if we ignore gamma knife and the 3 blows from boundman which Doffy took prior to awakening, Doffy still received comparable damage (Luffy got a few punches from Bellamy, Doffy got Injection shot, Counter Shock, Red Hawk, etc.).
Compare that to Katakuri, who used awakening right away against base Luffy and said he isn't underestimating Luffy, hence stopping him from using G4.
There is a reason Oda had Doffy wrecked and beaten down to a half dead state via Gamma Knife and boundman before even using awakening. And even then, Doffy managed to barely outlast boundman.