The number of doppelgangers produced by the technology of multiple shadow doppelgangers is far more than the usual shadow doppelgangers, and the consumption of chakra is too intense, so it is listed as forbidden by the leaf seal in the scroll. In the fighting style of Naruto, Shadow Avatar is the most basic technology, which basically has the same meaning as Shadow Avatar, but the number of chakra and Avatar consumed is not comparable to that of ordinary Shadow Avatar.
In the battle of Heaven with Payne, Naruto used a number of body double combined with variation techniques to disguise and achieve efficient and extremely ingenious tactical purposes, which turned into a large piece of rubble.
This technique can also rely on the technique of multiple shadows when being swallowed by large creatures to achieve a breakthrough (Naruto once used this technique to break through the belly of a snake psychic in orochimaru, and came out of the belly of the Monkey King with four tails in this way).
Because it consumes too much chakra, this skill is basically only suitable for Naruto, a giant ninja in chakra, but it is not suitable for less people in chakra, such as Kakashi.
Shadow doppelganger and multiple shadow doppelganger distribute chakra evenly to doppelganger, and everything experienced after the disappearance of doppelganger will return to ontology, including fatigue value. Ordinary movies are only divided into two or three parts, and many are divided into two parts, so it is considered forbidden.