Board Thread:Theories and Speculation/@comment-34661853-20181111160651/@comment-32685487-20181111171253

Kabuto used Hashirama's DNA to repair Sasuke's heart when Madara stabbed him right through it. Being gifted some Hag chakra boosted the awakening process for him, as without it he would have awakened it years down the line just like how Madara did. Naruto did not gain any flesh/dna from anybody at all, he only was gifted some Hagoromo chakra too. It's really just that simple.