That was a mistranslation. B said Naruto almost pulled it off during training.
If this is the case, Naruto would be limited to the use of the Kyuubi chakra that he has for himself. He would not be able to use the Tailed Beast bomb. But he would be a smaller target, hard to hit with Amaterasu given his speed.
It is much too big a target, true. However, there is a different between their transformations in that Naruto hasn't become the beast yet. The chakra he uses can just assume its shape, so it's not like Amaterasu is going to be hurting anyone since it would just be hitting chakra.
He wouldn't be limited. He would still have access to the even more massively OP form he just awakened. and let's not forget the Tailed Beast Rasengan, which he
may be able to do now.
Um, are you forgetting that Rasenshuriken slightly damaged and at the very least waylayed the "ultimate shield", the 3rd Raikage?

As he is even more powerful now, it is almost certain that unless Sasuke has the Yata Mirror, Rasenshuriken would slice right through it. Heck, danzo managed to do so with his Wind Release.
Not by much. His intelligence was rated as a 3.5/5 while Naruto's was a 3/5. In any case, Naruto isn't smart in the sense that he knows a ton of things, but smart in that he can force openings in your fighting style by using a bunch of unorthodox or very odd ways and fool you. This worked on even S-class ninja like Kakuzu and Pain. Heck, it worked on Tobi a few chapters ago with him being smart enough to leave a Bunshin inside Son in case Tobi stopped the real him.
And there's always the possibility of Naruto becoming even more OP with the looming possibility of a Sage Mode + Chakra Mode combo.... -shudders-
However, I do think you brought up some good points and presented yourself well. That's better than 90% of the threads made on this site, so well done and +reps.

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Thanks for the sensible reply! Let's make this an elite 10% thread
Well I agree that Naruto has lot's of things going for him, and a final argument always is that he is the hero and has to win. But here is a counterargument: if he does, the series is over ;] He needs a strong antagonist, and Sasuke is the best one!