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In this depiction we clearly see Naruto's .5 Kurama two Natural energy attacks clashing with Sasuke's 8.5 bijuu Indra arrow.
While most people will disagree with the .5 vs 8.5 stuff I would like to point out something very distinctive.
Through the VOTE2 fight Kurama was providing both Natural Energy and Chakra to Naruto.
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What does this mean? Sasuke truly indeed needed the bijuu to combat the capabilities of Natural energy by using normal Chakra.
Lets review this picture again:
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Clearly Kurama is gathering Natural energy
However Sasuke (Who had the bijuu under genjutsu) could not use the BIjuu for natural energy and thus gathered raw chakra from them.
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To me this means Sasuke knew he couldn't combat the raw power of Natural energy and thus tried to rely on an overwhelming amount of raw chakra.
In the end... They drawed with Sasuke admitting defeat.
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Meaning... Sasuke with 8.5 Bijuu (Using normal chakra) was = to Naruto with .5 Kurama using Natural energy
Thus Natural energy is atleast 8x the strength of Normal Chakra.
Another example of this is Hashirama vs MAdara :
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Natural Energy Mokuton combated the output of Chakra Perfect Susanoo AND 100% Kyuubi using Chakra only.
Thoughts?