You can't have 2 kaga level characters like hashirama and Madeira and have a Jonin level charicter like kabuto and naruto at chunin.
If you want Madeira and hashirama you need to genin level characters like kanahamaru or Hanabi Huyga
There the only useful ones anyway
I don't see how naruto is considered chuunin and Kabuto is considered jonin.
At the stage you said, the fight between Itachi and Sasuke, Naruto has full access to sage mode, rasenshuriken and 2nd state nine tails chakra cloak. He would easily rip many kage, for instance Tsunate. Also, in the original example you gave, you are very inconsistent - Neji and Shikamaru are both Jonin, Naruto should blatantly be kage level, and Sakura should probably be jonin or chuunin, so the squad would be JJKC - that means that to call my squad is weaker than your example - Obito, probably chuunin level. Kakashi could easily beat him, he only has kamui before he gets the rinnegan.(same as Kakashi). Madara is most definitely not a kage - he left the village for that very reason. Harashima is definately a kage, as he was the 1st hokage. Kabuto could only fight kakashi at that point as he caught him offguard and he had to fight many high level sound ninja, whilst worrying about Hiruzen, who he saw as a father.
Therefore,
Jonin - Madara Uchiha
Chuunin - Obito Uchiha / Tobi
Kage - Harashima senju
Genin - Kabuto Yakushi
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