Naruto in Naruto learned so quickly? Isn't he the tail of a crane? In fact, Naruto was able to learn to multi-shadow due to the protagonist's aura and the support needed for plot development, as explained below.
The difficulty of learning multiple shadow doppelgangers for the average ninja is the sheer amount of chakra, and none of these things are a problem for Naruto.
Many people wonder why Naruto has a crane tail setting and why he can quickly learn the multi-shadow doppelganger technique? Personally, I think Naruto was able to learn this trick thanks to the blessing effect of his protagonist's aura.
Naruto's problems during his time at ninja school were his lack of theoretical knowledge and his lack of proficiency in knotting, a problem that remained unresolved until the late Naruto Shippuden. The technique of multiple shadow splitting is actually not complicated (below) The difficulty is that it takes a lot of chakra to use, and excessive consumption of chakra may lead to the death of the user.
But Naruto has a protagonist aura, itself has a vortex family lineage, born with a huge amount of chakra, other characters due to the amount of chakra can not use multiple shadow doppelganger is not a problem for Naruto at all, coupled with the body sealed nine tails can also provide a huge amount of chakra support, Naruto who has learned ordinary doppelgangers in school before wanting to quickly master the multiple shadow doppelganger technique is very easy to get started, the principle of these two skills is not big and there are many places to learn.
Since the knot seal is not complicated + Naruto chakra nature is enough to meet the conditions for the use of multiple shadow twins is still relatively easy, the reason why multiple shadow doubles are listed as forbidden is not because the sealing steps are complicated, but because most ninjas do not meet the demand for chakras.
Naruto's ability to master the high-level multiple shadow splitting technique in an instant is a need for plot development, otherwise the main plot envisioned by Kishimoto could not unfold.
The reason why Naruto was instigated to steal the ninjutsu scroll was that he wanted to graduate from the ninja school quickly, and according to Konoha's rules, the first condition for becoming a ninja was to be able to graduate from the ninja school. However, Naruto's poor performance in the graduation exam process was judged to be unsuccessful and had to find another way out.
The question was why, since Naruto was not good at ninjutsu, was he able to master high-level ninjutsu in a very short period of time? Personally, I think that in addition to the ability blessing of the protagonist's aura, the main plot development requires Naruto's plot direction to some extent is the original crane tail Naruto growth counterattack process, if Naruto can not successfully graduate from the ninja school, the back counterattack road can not be talked about, in order to successfully let Naruto complete the graduation exam requirements to successfully use the doppelganger to have the bridge section of learning multiple shadow doppelgangers in the back instant, otherwise logically Naruto stole the scroll the time from the graduation exam time is not long.
It was impossible for Naruto to quickly improve his shadow doppelganger level in such a short period of time, so I personally believe that being able to successfully learn the multiple shadow doppelganger technique in the subsequent plot was not the embodiment of his individual talent (Naruto's talent point was not in ninjutsu), but in order to advance the plot, it was difficult for Naruto to learn multiple shadow doppelgangers, otherwise it would be difficult for Naruto to survive in a combat environment dominated by ninjutsu.
After all, Naruto doesn't know the Eight Doors, and his physical skills alone are no better than some ninjas with special abilities. Letting Naruto learn multiple shadow doppelgangers makes up for the fact that Chi chi is not good at using the Five Attributes Escape Technique, and is also able to take advantage of his large amount of chakra. So that the plot can be smoothly unfolded according to Kishimoto's vision, of course, there are still loopholes in logic.
Finally, to sum up, the reason why Naruto was able to learn multiple shadow doppelgangers as a crane tail was due to the blessing of the protagonist's aura (to meet the requirements of the use of skills with a huge amount of chakra), and the development of the plot to the need, if Naruto could not learn this trick, it would be nothing more than graduation from ninja school, and the follow-up counterattack road would not be able to unfold smoothly. Please forgive me for the place where the analysis is not in place, and if you have other ideas, please leave a message to discuss.