Theoretically at the 7th gate he should be the strongest. It's always been my view that Gai is the most efficient user of chakra in the manga. This is because chakra is a natural resource utilized by cells in the body during cellular respiration. Infusing chakra into modern ninja techniques is, by comparison, inefficient in terms of (results/chakra used).
The problem for Gai is there aren't any feats that directly document his strength, in terms of being able to lift or throw heavy objects. He does have extreme muscular control of his body, being able to perform the Asa Kujaku which, during his last fight with Kisame was around 500+ punches at supersonic to hypersonic speed (this is the speed required to allow enough friction with the air to produce the flames and the sonic booms associated with the technique). Also, he has been shown to have enough strength to jump right up into the clouds using just his leg muscles and cover a fairly large distance with the sixth gate.
Hirudora's ability to deliver a powerful shockwave through a fair distance of water, render a powerful ninjutsu technique null, annihilate all surrounding clone entities, and have a strong effect on the environment (a distinct shockwave that enveloped the entire island) emanate directly from one simple body movement. Obviously an insane amount of strength is required. This can only be achieved by inducing the 7th gate.
The problem for Gai is there aren't any feats that directly document his strength, in terms of being able to lift or throw heavy objects. He does have extreme muscular control of his body, being able to perform the Asa Kujaku which, during his last fight with Kisame was around 500+ punches at supersonic to hypersonic speed (this is the speed required to allow enough friction with the air to produce the flames and the sonic booms associated with the technique). Also, he has been shown to have enough strength to jump right up into the clouds using just his leg muscles and cover a fairly large distance with the sixth gate.
Hirudora's ability to deliver a powerful shockwave through a fair distance of water, render a powerful ninjutsu technique null, annihilate all surrounding clone entities, and have a strong effect on the environment (a distinct shockwave that enveloped the entire island) emanate directly from one simple body movement. Obviously an insane amount of strength is required. This can only be achieved by inducing the 7th gate.
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