Gonna be honest here I don’t think I understood half of what I just read
We know that the Melding Universe Makuta had the elemental power of light, but light as an element does not have an inverse effect of what is associated with shadow, as shadow itself does not produce any negative qualities. It was the Makuta’s tampering with shadow that lead to the association, and beings outside of the Brotherhood’s influence who use shadow as an element (such as Shadow Stealer) did not have any moral misgivings akin to the Makuta.
So it’s an interesting theory, but not really based on anything.
