When does it say Naruto equally distributed his chakra? Even in headcanon that doesnt make sense because he was fighting a god why would he split his chakra evenly in 5ths? Plus Sakura had been storing chakra for 3 years and it runs out in a few hours there is no way she is anywhere near Naruto level who can fight wars with little rest and still have enough to pressure otsutsuki. On top of that, he only had 1/2 of Kurama's Chakra at the time.