Board Thread:Boruto: Naruto the Movie/@comment-25139119-20150901144803/@comment-6769189-20150903053957

Over rating would be saying that Part 1 Battle of The End Sasuke and Naruto could beat Madara....

Anyways, in regards to the chakra, Naruto could simply just not have used it against Sasuke for that last bit, instead relying only on the natural energy. There is still no account of self-regenerating lent Biju chakra.