Claiming the Jinchuriki can't solo because the Bijuu is there also is an abuse of semantics...
You can have the strongest weapon forged but if you don't know how to use it, then it doesn't matter. That's what the Bijuu is, it's a weapon for the Shinobi to use. As was said before it's up to the host to decide how to utilize these powers.
You can have the strongest weapon forged but if you don't know how to use it, then it doesn't matter. That's what the Bijuu is, it's a weapon for the Shinobi to use. As was said before it's up to the host to decide how to utilize these powers.