Board Thread:Naruto Discussions/@comment-24120130-20140725123237/@comment-3568954-20140826130256

Elveonora wrote: He simply meant that the same power they have can be learned in the cave, there's no connection beyond that.

wrong Kabuto's exact words were as fallowed"orochimaru wasn't interested in jugos rampages, so much as the origin of his clans power. and he finally found the source . it was Ryuchi Cave"

You can deny it all you want but the fact is that there senjutsu came directly from Ryuchi Cave. whether it was some ancestor training in Ryuchi cave and the rest of them lost control of themselves or some other reason. non the less Ryuchi cave is the source of there senjutsu