Board Thread:Theories and Speculation/@comment-45444155-20200728155230/@comment-3523655-20200801172441

Well he SAYS he has Karin's cells.

Sasuke guesses he has Jugo's cells and Kabuto doesn't correct him (but he IS using Sage Transformation, which is basically a Kekkei Genaki, so it's safe to assume he implanted Jugo's cells too).

And he SAYS he created a variant of Suigetsu's technique.

That's the basis.