Board Thread:Theories and Speculation/@comment-33485854-20180625233306/@comment-30323490-20180701084038

@LegionZero Kabuto said: “with my medical ninjutsu, the cells of Hashirama that i studied so far and someone’s advise, i could save his live”.

So yes, he did use Hashirama’s cells.Otherwise Sasuke’s rinnegan awakening wouldn’t make sense. And i’m assuming Kabuto used a small part of Hashirama, something like Madara had during his lifetime after he stole a small part of Hashirama’s flesh.Hence why Sasuke doesn’t have WR. And that Hagoromo speed up the awakenng process since Madara had to wait years and years to awaken the rinnegan.