Dont count for it. He was using SM for several hours and he does not give a shit. Kishimoto has to keep them equals, so he obviously wont get exhauasted anytime soon. In fact, it seems that only now he bacame serious. The sparrings is over, there is time to fight.His base power was boosted upon obtaining chakra from the bijuu\sage but i think hes really pushing his limit this time around.
Also, keep in mind that Rikudo only gave them chakras that was meant for Kaguyas sealing in the first place. Sasuke achieved Rinnegan becuase of Hashiramas cells from Kabuto. Naruto received Rikudo senjutsu becuase of chakras of 9 Bijuus inside him. Hogoromo didnt boost their powers, he only gave them means to seal Kaguya.
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