This is actually an idea I had a while ago but I had no internet so I couldn't post it. And then this chapter came along and supported it so I was reminded. Naruto's ultimate kyuubi form won't be nine tails but nine kage bunshins (or eight and one Naruto) each with one tail Just think how hard to beat they would be. Even if you can handle one can you handle nine of them attacking from different directions? And the damage to each one would be limited so they would last longer and do less damage to Naruto's real body. Every Naruto would be fast strong and almost indestructible -able to form shields and attack at ranges and so on.