I've repeated this ad nauseum, but Oda doesn't usually care about Luffy's "overall" power when beating an opponent. By reading his interviews and reading the fights, you can tell the only thing that matters to him, is "does Luffy have enough tricks up his sleeve to knock this dude out at least once?". That is very different than "does Luffy's overall skillset in combat surpass this other person's?".
Two opponents that most agree that Luffy wasn't stronger than are Enel and Crocodile, and Oda made this clear as well:
(1) Enel: "Knowing how tricky he would be to beat, I'd imagine he could reach as much as 500,000,000. Luffy was lucky to be rubber."
Oda himself admitted Luffy's win was down to mere luck due to a mismatch between their powers, not because Luffy was stronger overall in terms of combat.
(2) Crocodile: Crocodile was imprisoned....drumroll...in Level 6. Luffy was imprisoned in....Level 5. Yes, even with his superior bounty, destroying Ennies Lobby, and burning the World Government flag/declaring war on them, he was still not considered on Crocodile's level.
We know for a fact that Ace was stronger than Luffy, as Luffy himself stated it. It was also mentioned by Ivankov that the Warlords possessed the power to kill Luffy in 1 hit. This is where all the Warlords like Jinbe, Doffy, Croc or Warlord-invitees like Ace go down to (Not to mention Shiki as well). Crocodile was shown to rival these dudes in the cell and in Marineford.
Two opponents that most agree that Luffy wasn't stronger than are Enel and Crocodile, and Oda made this clear as well:
(1) Enel: "Knowing how tricky he would be to beat, I'd imagine he could reach as much as 500,000,000. Luffy was lucky to be rubber."
Oda himself admitted Luffy's win was down to mere luck due to a mismatch between their powers, not because Luffy was stronger overall in terms of combat.
(2) Crocodile: Crocodile was imprisoned....drumroll...in Level 6. Luffy was imprisoned in....Level 5. Yes, even with his superior bounty, destroying Ennies Lobby, and burning the World Government flag/declaring war on them, he was still not considered on Crocodile's level.
We know for a fact that Ace was stronger than Luffy, as Luffy himself stated it. It was also mentioned by Ivankov that the Warlords possessed the power to kill Luffy in 1 hit. This is where all the Warlords like Jinbe, Doffy, Croc or Warlord-invitees like Ace go down to (Not to mention Shiki as well). Crocodile was shown to rival these dudes in the cell and in Marineford.