What does perfect jinchuriki yagura have to do with anything? Do you know how strong he was without his jin? No. That doesn't change the fact that he was using some of his bijuu's power to boost his own. WIthout kurama, naruto can't spam shadow clones which is the essense of his fighting style. Without kurama he'd barely be able to pull off 1 rasenshuriken because of the 2 shadow clones and massive chakra drain it takes. If he missed, he'd effectively be screwed and have to get into SM or die.man screw this.
Let's take gaara for example. Without Shukaku, he's still kage level. He can't manipulate as much sand, but he still has every move he had before. Infact, without his mom (auto-sand) he'd STILL be kage level, because he basically has his father's arsenal/attack scale and his father was a kage.
there were two hosts before naruto. It's the same for the hachibi; Though i don't know how many hosts it had before, bee wasn't the first. Because naruto is the first of 3 doesn't mean he is the only possible one.to the bold, even if it is true, no one has done this up until naruto got the fox, so whether or not anyone else could control the fox is completely irrelevant, seeing as no one has up until now. The fox without naruto is a mass of hatred and drives most people insane. only uzumaki's thus far have been it's host since being a jinchuuriki puts a strain on the body.
You can argue all you want but the fact is without naruto, the fox wouldn't be as much of an entity as he is in the fight against the juubi, before naruto got to him he was nothing but a living grudge. naruto did what no one else could, he tamed the fox, therefore it is his power and his alone.
That doesn't make sense. Without naruto, kyuubi would be a better force against juubi. Infact, naruto only has 50% of it's power in the first place and he's using kyuubi's chakra to split with his friends. That's the only useful thing naruto's doing that the kyuubi wouldn't be able to do - sharing chakra. Without naruto, it'd still have it's powerscale and what not. It might have even been more powerful because naruto still can't attain a full transformation; only an enhanced cloak.
The fact is, it's not his chakra, nor is it his power. It's just power he has access to. If it can be taken away, it's not his. Naruto's own chakra can't be extracted, therefore it's his. But the kyuubi can be extracted and completely seperated and thrive on it's own, or even used by someone else. Then, it'd no longer be his power. How can it be his alone if he can lose it to someone else? Since it's a being that is able to self sustain, it is not part of him, even though it's been sealed within him. It doesn't matter what the kyuubi was without naruto, naruto didn't give him anymore power than he already had; he gave naruto the power.