I feel like Ozai is heavily overrated and zaheer is heavily underrated. Most of ozai's insane feats were due to sozin's comet, which turns flames that would otherwise be no stronger than a military flamethrower, into weapons of mass destruction.
I feel like you could honestly make an argument for Azula being above Ozai, as Azula uses blue flames and is shown in the opening of the show(along masters of every other element).
Comet aside, Ozai himself isn't that impressive. Zuko could have killed him, but chose to redirect his lightning into the ground, instead. Aang could have killed him without the avatar state, but chose to redirect his lightning into the sky because Aang's a buddhist and doesn't kill. It is very likely that if not for Sozin's comet, Aang might have honestly mid diffed him without the avatar state.
Zaheer on the other hand is one of the strongest airbenders who ever lived. Yes, he was getting beaten up by tenzin, but that was only before his enlightenment. Once P'li died, Zaheer gained enlightenment and obtained the ability to fly. This is an ability that is so rare that literally nobody in the series has it: not Aang, not tenzin, and not any of the past avatars. The only other people who can do something similar to this are appa and the flying bison, the original airbenders.
Bhumi(aang's son) exclaimed how insane zaheer's movements were, and he has seen both aang and tenzin airbend.
Tenzin himself stated that Zaheer was using airbending that hadn't existed for thousands of years.
overall, this leads me to say that without Sozin's comet, Zaheer could probably defeat Ozai. I'll give Ozai the benefit of the doubt as firebending master and say that Zaheer could high diff him, but I honestly wouldn't be surprised if it was a mid or low diff, as like I said before, Zaheer is one of the strongest airbenders in the series.
I feel like you could honestly make an argument for Azula being above Ozai, as Azula uses blue flames and is shown in the opening of the show(along masters of every other element).
Comet aside, Ozai himself isn't that impressive. Zuko could have killed him, but chose to redirect his lightning into the ground, instead. Aang could have killed him without the avatar state, but chose to redirect his lightning into the sky because Aang's a buddhist and doesn't kill. It is very likely that if not for Sozin's comet, Aang might have honestly mid diffed him without the avatar state.
Zaheer on the other hand is one of the strongest airbenders who ever lived. Yes, he was getting beaten up by tenzin, but that was only before his enlightenment. Once P'li died, Zaheer gained enlightenment and obtained the ability to fly. This is an ability that is so rare that literally nobody in the series has it: not Aang, not tenzin, and not any of the past avatars. The only other people who can do something similar to this are appa and the flying bison, the original airbenders.
Bhumi(aang's son) exclaimed how insane zaheer's movements were, and he has seen both aang and tenzin airbend.
Tenzin himself stated that Zaheer was using airbending that hadn't existed for thousands of years.
overall, this leads me to say that without Sozin's comet, Zaheer could probably defeat Ozai. I'll give Ozai the benefit of the doubt as firebending master and say that Zaheer could high diff him, but I honestly wouldn't be surprised if it was a mid or low diff, as like I said before, Zaheer is one of the strongest airbenders in the series.
