The whole point of this manga is about Will and love. having a will like naruto and the sage, is basically power in itself.
The will to never give up, To strive for more greatness and to protect the ones you love.
Thats the idea of the manga. naruto is powerful enough on his own without kurama. His will to never give up will always succeed. Thats the message kishi is trying to convey to us. Thats how naruto was able to beat obito, someone who shared the same ideals as him growing up but steered to darkness. He was also way too powerful for naruto.
i edited that post :yeah:
and i get the whole point of this show but, Naruto beating Madara without the Kyuubi would be like konohamaru beating Pain (power of will is useful but you still need to apply some logic to the series/even Kishi knows that).
not being able to beat someone who is levels a head of you doesn't contradict the "power of will/never give up" message, coz that massage can be applied in the training sessions to become stronger but, it doesn't mean that you can receive senseless power from thin air (you need a real reason/actual way to receive power).
you can't just say "the power of will" and BOOM you are a Jinchuuriki, get what i mean.