That's what I thought too, but the Ten-Tails is ONE beast. It just has the power of nine so that doesn't really count.Hmmm u never know the sage had the ten tails wich was all of the tailled beasts in one so i dont see why sumone couldnt contain two of them but they would have to be really powerful
I don't know how one person's body could handle that kind of power besides the SageIs it possible for a jinchuriki to have more than one bijuus
I agree with thisThere is no actual proof to answer this but since the beasts were sealed inside Gedo Mazo and were still individual (Tobi put them back in edo hosts) it might be possible to seal more than 1 in a living person, although that person must have something special, to be able to contain all that chakra...