And chakra is a spiritual object.If nagato could do that to bee and naruto then it is = he cant because he didnt do it to itachi or absorb his susanoo. Two KKG are necessary to pull a user of susanoo or destroy the susanoo as proven by mei combining lava and vapour to break or onoki combining his spiritual lightening jutsu with gaara's spiritual sand.
Gaara sand being his mother's spirit proof :-
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Gaara sand (spiritual) + onoki lighten jutsu (spiritual) = Susanoo user being ripped out.
If gaara could do it alone he could've used the sand underneath madara's susanoo before his sand was lightened by onoki.
Gaara's sand is made of chakra and Onoki's techique is chakra based technique