Based on new evidence provided we need more clear proof izana is = to mikey since its proven mikey wasn't 100% in that fight based on him:
fighting draken before hand and his sister dying in his arms. With multiple
statements about how he
shouldnt be able to even stand.
Izana also prepped for Mikey before hand and
was knocked out with a single kick, while Izana hit him a number of times and mikey never went unconscious. Mikey also was in base, when Draken said "
Mikey was going all out" he is referring to that particular moment, keep in mind Izana has no damage at the beginning of the fight and mikey is already bruised up from when Mikey was hit repeatedly by Draken before the fight.
Draken has never heard of Mikey's Dark Impulse either to see Mikey go all out to say he is equal. Remember
Takemichi told Mikey to release his full dark impulse, which is the first time he released everything. Mikey wasn't fighting Izana for the sake of proving he stronger, while Izana was and still lost the fight, which he admitted. Izana was just was physically inferior which is why his limbs got tired even though he hit Mikey far more.
God Tiers:
Based on my Mikey comment this would also narratively make Izana weaker than South and Foresight Takemichi and relative to Senju and Taiju. Senju is the only person besides Mikey to knock South to the ground when she stopped hiding her true strength, even Draken couldnt knock South to the ground and Kakucho was no diffed by Base South, while Senju knocked Dark Impulse South to the ground. Taiju easily beat the Greatest Duo who have shown relativity to Base South with Benkei being able to send him flying with punches and Wakasa overpowering South with his speed, agility and kicks.
High Tiers:
Kakucho is not stronger than Takemichi with foresight and hasn't shown comparability to anyone listed above at their peak. He scales relative to Draken, Hanma, Wakasa/Benkei, and Sanzu with a katana as shown in the 3 deites arc he is able to send Benkei flying , but was caught off guard by Wakasa. Sanzu also killed Kakucho, Mucho and cut down Taiju.
Angry Kawata and Mucho should not be this high as they were both one shot by Kakucho in Tenjiku arc
Inui or Koko don't have any feats above Draken to say they are stronger, and Inui was temporarily knocked out by Yuzuha and mid-high diffed Chifuyu. Koko and Inupi were both beaten and kidnapped by Mucho and Mucho is narratively weaker than Draken if he can be one shot by Kakucho. Draken went toe to toe with base South.
Osanai I agree with. He should be the lowest High tier along with Baji and Pah-Chin's durability who could tank multiple Osanai punches as well as 3 attacks from DI Mikey.
Mid Tiers:
Baji is far stronger than Chifuyu and his underlings. Chifuyu couldnt restrain him during Valhalla arc and Baji wasnt even trying his hardest. Baji is also the savior for them in the spinoff he can one shot people that they struggle with. Kazutora is also narratively equal to Baji.
Base Takemichi is the strongest mid tier as he fought brought Taiju Shiba to his knees after Mitsuya who fought Taiju at 70% could not. Peh-Yan is the next strongest mid tier as he has statements that he is stronger than Mitsuya. Inupi and Koko fall in line with this tier of characters. Chifuyu is relative to Mochii. as well Smiley who has fought Mochi several times in the past, Mitsuya, Kazutora, Ryusei, Kojiro, Hakkai, Ran, Rindou, and Mochi. Since the Haitani brothers ambushed and beat Smiley and Mitsuya then were later beat by mitsuya and hakkai, they should all be comparable to each other
The low tiers:
Overall I agree here.
Updated Chain should be
DI Mikey > Base Mikey > DI South > Foresight Takemichi > Izana => Senju > Taiju > Sanzu with Katana(killed Kakucho)> Wakasa = Kakucho = Benkei = Draken => Hanma > Angry Kawata > Mucho > Osanai > Pah Chin(dura) > Baji => Kazutora > Base Takemichi > Koko = Inupi > Peh Yan > Mitsuya > Hakkai > Ran Haitani = Rindou Hatani > Chifuyu > Mochi > Smiley > Ryusei = Kojiro = Kojima
Low tier stays the same