Kurama is the source of Naruto'a chakra:
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Kishimoto has never stated, not even once that Uzumakis have large reserves; they only have special chakra and strong life-force or strong chakra that grants them longevity. We only know two Uzumakis with large reserves out of so many that were killed and those that went into hiding. Is this your logic? It's nothing but your own fiction. Naruto is also a cheap Uzumaki knock-off. Red hair are pivotal for a Pure Uzumaki. It actually represents their pure Uzumaki blood:
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Another thing you made up, it seems. Large chakra also doesn't have anything to do with Kurama sealing. Get over it already, man. Kushina says herself that her chakra was simply special or powerful to contain the beast. Madara giving Nagato Rinnegan has nothing to do with Naruto. Naruto can only dream of having as much chakra as Nagato.
Why? Kakashi stated that himself. Maybe you should read the manga, pal.