Ok this question has to do with 3 different things I noticed about the Leaf government.
1. Promoting Genin to Chunin
As you know during the Chunin Exams in part 1 only Shikamaru was promoted to chunin. But the speech Hiruzen gives after the Chunin prelim battles, makes it seem that anyone at anytime during the finals could be promoted. Promotions are decided by village ninja and daimyo or their respective nations. Now we know that Sasuke, Naruto and Neji were not promoted despite the 3 of them fighting at chunin level and all being recognized for their talent.
My question is why weren't they promoted? The Chunin exams are not just about promoting Genin but also maintaining military strength. Seeing how Kakashi and Itachi were able to make Jonin and Anbu at the same age as Part 1 Neji, Naruto and Sasuke; it seems odd the Leaf council didn't promote them. You have 3 ninja (2 confirmed geniuses) who are heirs to 3 of the 4 strongest founding clans of the Leaf village; Uzumaki/Senju (Naruto), Hyuga (Neji), Uchiha (Sasuke). Who does it help to sideline rising talent/future defenders and money makers for the village by continuing to give them D-rank missions? Catching cats and pulling weeds out of gardens are not the best use of any of the aforementioned Genin's skills.
In part 1 and 2 you have chunin such as Kotetsu, Izumo, Iruka, and Mizuki. Fodder ninja with limited applications who somehow got promoted to chunin. How? Who is making decisions for promotions in the Leaf Village?!
2. Why did no one train Naruto to control the Kurama in the Leaf village? Gaara learned to control and use Shukaku, Yugito and Bee learned to control and use the 2 tails and 8 tails, Yagura was the Mizukage and jinchuriki of the Hidden Mist; presumably he could control the 3 tails and so on and so forth. Why did the Leaf village seem totally in the dark about instructing Naruto to use Kurama's chakra? It's not like it was some sort of secret who the jinchuriki was in the Leaf. How does every other village have a way to temper a jinchuriki but the Leaf was lost on the whole thing?
3. Why does Kakashi never use his Sharingan to suppress the 9 tails chakra? Instead he relies on Yamato + 1st Hokage necklace and Jiraya seal stamps. Obito put the nine tails under genjustu with one sharingan (his natural), Sasuke suppressed Kurama with 3T sharingan, Madara tamed the 9 tails with his MS/EMS. We know Danzo impanted both sharingan and hashirama cells so he could potentially control Naruto in the future, but why does Kakashi never use his sharingan to that effect? It's not like it's a secret to Leaf higher ups what the sharingan can do to tailed beasts. Guess he was too lazy to try.
1. Being a chunin means you have to have the mind of a chunin and know how to lead a team. Naruto wasn't mentally ready, Sasuke fought Naruto and looked like he wanted to kill Naruto as Kakashi commented so Kakashi mentioning that to Tsunade and the fact that Sasuke left Konoha with the sound 4 the next day caused him not to be promoted. Neji lost and didn't show any chunin mentality as Shikamaru did; he also showed to be mentally affected by how the main branch treat the second branch.
2. Who would have trained Naruto to learn how to use Kurama? Naruto didn't have the Hokages necklace until when Tsunade was introduced and Yamato wasn't introduced until Shippuden and Naruto went off to train with Jiraiya who was training him to use Kurama's powers. Naruto being the Jinchuuriki was also made taboo so no one could have talked about it and the village was already damaged by Kurama when Obito controlled him and Hiruzen couldn't handle full Kurama when he had other ninjas backing him up and he was 12-13 years younger than when Naruto was Genin. The only prefect Jins were Bee and Yagura according to Mei; Cloud village experimented with how to control the 8 tails is how they knew how to do it with Bee.
3. Kakashi is not a Uchiha, Itachi already said Kakashi can't use the Sharingan as well as a true Uchiha. Sasuke only suppressed a small portion of a caged Kurama chakra while Obito and Madara fully controlled full wild Kurama. Well I think the fact that Danzo felt like he needed Hashirama's DNA along with the Sharingans show that a non-Uchiha can use only the Sharingan to control a Bijuu.