Lets leave aside the fact that if we take Kurama out of the equation Minato and Kushina would still be alive and Naruto would be just as badass learning jutsus from his father, sealing jutsus from her mother, and still have huge amounts of chakra on his own (he's an uzumaki)
Right now without the fox:
- he would still have SM, and would have been better with it (Ma & Pa could have fused with him and considering his own chakra level he could have stayed in Sm for a very long time)
- he would still have his summons
- he could still use the Kagebunshin and the Rasenshuriken (yes not as much as he does now but could still use it)
Until recently the only thing he got from Kurama was a little boost of chakra... but remember that Kakashi said Naruto himself has twice as much chakra as him... and look at what Kakashi is capable of.
Right now without the fox:
- he would still have SM, and would have been better with it (Ma & Pa could have fused with him and considering his own chakra level he could have stayed in Sm for a very long time)
- he would still have his summons
- he could still use the Kagebunshin and the Rasenshuriken (yes not as much as he does now but could still use it)
Until recently the only thing he got from Kurama was a little boost of chakra... but remember that Kakashi said Naruto himself has twice as much chakra as him... and look at what Kakashi is capable of.