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I have seen some comments in the base that only Toad Senjutsu shows "more evidence" that Strength boost is exclusive, but the fact is the Manga never implied that Sennin Mōdos have different Boost feats. During Naruto's training Fukasaku never excluded such a thing as he always implied natural energy in general, when speaking to Naruto. The only difference here is of course, the characteristics of entering this Mode. So the fact when you look at Naruto's training, this is what you can imply to what natural energy was able to do for Kabuto.
An example would be when Base Naruto had no such strength feat to lift up Giant boulders [
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] but as soon has he gathered natural energy he was able to perform this strength feat. [
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] This implies that natural energy is what enables the character to get such a feat.
As soon as Naruto mastered natural energy, he was able to block a Summoning monster's attack [
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] and even use his strength to throw one. [
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] Naruto also used natural energy to even pick up and slam the Kyūbi himself. [
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Kabuto has mastered Sennin Mōdo and Natural Energy so this applies to anyone who has mastered these this.
"The Addition"
Since Kabuto has access to Jirōbō's DNA he can also enable his strength, as long as he is exposed/present. Jirōbō's State 2 enabled him to have the strength to even lift up Chouji's Chō Baika no Jutsu. [
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][
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][
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][
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][
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] Depending on how much weight you think Chouji has, he is basically Summoning level of weight capacity.
Kabuto even noted that using the Curse Seal shouldn't be compared to a master of the art of a Sage. [
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] So having Jirōbō's DNA gatherdc with Sage Boost makes it a done deal that his strength makes him the most, physically strongest character in the series. Also, any physical contact with Jirōbō can even do this: [
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] Subjugating their opponet allows him to absorb chakra, much like the Sound ninja, Yoroi. [
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]
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