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Muki Tesnsei is overpowered even if only controlling Inorganic material. Lets see how this jutsu works exactly.
This jutsu allows the user to control things that have no life functions by gifting them with some of their own life force, allowing the user to freely manipulate the substance according to their will.
Now since Kabuto can do this too all inorganic components, I can give you a list of Inorganic material which no one will read:
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Or I can list the important factors in Naruto-verse that Kabuto can freely manipulate.
First we have to notice the
requirements in order to freely manipulate inogranic material.
f you notice here [
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], Kabuto clashed with metal here, an inorganic materiel, and was never affected by Muki Tensei. As soon as he drew back to perform the jutsu [
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], only the whole cave was manipulated [Keep note that Kabuto was only on one knee here, he his palm wasn't touching the ground]. This concludes that the jutsu only works for the last inorganic materiel he had touched, as you can see here [
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]. So;
→ Step 1: Touch inorganic materiel. [
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]
→ Step 2: Weave the hand seal. [
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]
(Step 1 and 2 can be vise-versa)
What are the important factors that he can freely manipulate? Well the 5 basic elements, metal and even sand can be part of his arsenal. As long as he is able to touch it, he can freely manipulate it after he weaves his hand signs.
And that is not all. Take a look at the jutsu's description again above. It states 'allowing the user to freely manipulate the substance according to their will' and furthermore, now take a look at Kabuto's statement when the jutsu was activate [
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] and after Sasuke countered it. [
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]
→ What does this mean? According to Kabuto, the cave changed it's shape and then returned to it's normal shape after Sasuke used Amaterasu and according to the jutsu's description, the user can freely manipulate the substance according to their will. In other words, it can change shapes so Kabuto is capable of manipulating it to more shapes such as hands which can grab the enemy, snakes which can envelope the enemy, etc. so he doesn't have to manipulate them only to spikes.
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-AkatsukiChurch added the last point-
