I don't think kurama absorbed all the natural energy on the planet. just the maximum amount it could handle. Or naruto could, I don't even know who was absorbing it. Isn't naruto the one who asborbs naturale energy? Kurama just replenishes it's own chakra?
Yes, but Kurama was the one talking, and I didn't see a clone. I had though Kurama said he absorbed every bit of natural chakra above the ground.