Wait, naruto trained for quite a few of his power ups. A.k.a Sage Mode, Rasenshuriken, Rasengan, frog summons, and more. Stating that Naruto is what he is just because of kyuubi's power is pushing it considering this. The same can be said for Susake, though not to the same extent. He trained to learn and develope a lot of abilities, and even if he was gifted a lot of power, he's not achieving what he has without some work on his own part.