Notes:

The moment the human and his Bijū are united, it happens that if the Jinchuriki dies, the Tailed Beast within him does too (although the beast revives again shortly after).
And if the Tailed Beast is extracted from the human that owns it, he dies, so the beast and the jinchuriki must grow together.
me: if the case that death of one Bijū, he reset his memory to zero?