it's the same thing everytime we debate on it, for all we know, there is no Naruto without Kyubi, at least not on the pyshical level, it's not like the curse seal, that can be turned off and on. we know that Naruto's healing was always fast, even before first releasing the Kyubi, and even with the five part elemental seal, Naruto still had the fast healing factor thing, so we can't say it's only his stamina...

but still, even without the Kyubi, Naruto would still have the same personnality, and would still work hard to be the best.