Wait a minute... White Zetsu is of Hashirama ... Black Zetsu is of Madara... that makes the whole Zetsu one part Senju... one part Uchiha...
O. M. G.
ZETSU IS THE REINCARNATION OF THE SAGE OF THE SIX PATHS!!!! It all makes sense now...
It's amazing to me that, unlike in the real world, people on the internet will wear "everyone thinks I'm a moron" as a badge of honour.