Also, considering Simon just defeated the strongest Lantern with the LE (albeit unmastered) with his own power and then got chosen by the Ring, wouldn't it be kinda like Naruto trying to lend Chakra to the Kurama? Like would he be the one charging the lanterns and taking ION's place?
It should be noted that when Simon powers up into the STTGL, it looks like he
absorbs the Spectrum blasts (and as it ends with "Choose Life", White Lantern + Source power) that Kyle shot at him to manipulate his emotions. Meaning that if Simon takes the Ring, he probably is in the same unique position Kyle is, as a person who the Source (and Spectrum) is intrinsically tied to and putting his power through it. Which empowers that
entire firmament of the whole Cosmology, since the Emotional Electromagnetic Spectrum is one of the 7 Key Components that make up the Bedrock of Creation, alongside the Dimensional Superstructure, the Collective Unconscious, the Godsphere/Magic, the Speed Force, etc.
EDIT: Essentially, Simon becomes not just
Ion, but
every Spectrum Entity/Deity and serves as an INFINITE BATTERY and SUPERCHARGER for their powers, alongside granting each access to his now Source-Spiral Energy, or granting them all the
mathematical truth of Life is worth living.
Which is incredibly ironic. The Spiral Nemesis was about how an overabundance and use of Spiral Power would end the Cosmos, and Simon--Through Kyle--Is granted the perfect means to prove the Anti-Spirals wrong and lead the world into ULTIMATE paradise, as he said he would when the Cosmos was entrusted to him. It fulfills the prophecy and breaks past it, which is exactly what Simon (and Kyle) are as characters.