Board Thread:Fourth Databook/@comment-4366149-20141122004623/@comment-1512913-20141124182113

Re-read the fight against Itachi and Sasuke. It was said Kabuto has Jugo's power and then Kabuto goes on about how Jugo's Clan have unique bodies that passively absorb natural energy. Also Jugo is one of the subjects shown when the blood soup flashback is shown. On top of that, in the chapter Orochimaru's revival, Jugo himself confirms Kabuto uses Senninka.

On the part: "Kekkei genkai are techniques/abilities that are inherited through blood. But not all traits inherited through blood are kekkei genkai" I never disagreed, it's true, but nature affinities, life force and so on are things that everyone has while passive absorption of natural energy and X-Men transformation aren't.