paradiselost541@ Well, first of all thanks for reading.
To your question; The Yamata seal is not the same as Kyubi. Kyubi was directly sealed to Naruto. I said "The blood of what was left of the Orochi". A whole clan doesn't have the same blood type. A family do.. So The Yamata was in the blood of Orochimaru's family three. And the last survivor was Orochimaru. (The last blood that was left)
(In Myth it says the Yamata awakes every 100\200 years...)
Maybe I shouldve explained it, I was avoiding to get too much into the theory.