Except the Nihilus part, it seems very well presented.
__________________ RealistRacism: "Sheevites, much like the Banites, were meant to increase in power with each member. From Lightsnake to Gideon to Azronger, this was supposed to be the case. However, knowledge must've been lost in some kind of Gravid-like incident, as Az turned out to be a mid-tier debater with a sub-par track record, sh!itting all over Tempest's legacy. Sad."
It potentially helps to emphasize the gap between Spirit Valkorion and Physical Valkorion.
> Chained Vaylin overpowers Spirit Valkorion's time stop (and yes, this scene essentially confirms it's either time stop or mass stasis), Valkorion only being able to defeat her via conditioning.
> Chained Vaylin is stated to grow exponentially more powerful as time passes by Valkorion himself, Vaylin unchains herself to grow even more explosively in power. By this point, Vaylin should be far, far more powerful than Spirit Valkorion.
> Valkorion consumes Vaylin's spirit, feeding on her power and using her as a puppet against the Outlander.
> The Outlander uses the holocron to sway Vaylin from Valkorion's hold, freeing and presumably un-consuming Vaylin's spirit. At this point, it's just Spirit Valkorion vs. Spirit Outlander/Vaylin/Arcann, who the Emperor handily defeats.
However, if we were to extrapolate their spirit fight to how a battle would go in the physical realm, at least in terms of pure power, it would look like:
You could also make a case that a few KOTET characters scale (vastly?) above the Vitiate that ended all life on Ziost. Or even Nihilus, if you really feel like it.
__________________ ”You presume limits to my power. There are none.”
__________________ RealistRacism: "Sheevites, much like the Banites, were meant to increase in power with each member. From Lightsnake to Gideon to Azronger, this was supposed to be the case. However, knowledge must've been lost in some kind of Gravid-like incident, as Az turned out to be a mid-tier debater with a sub-par track record, sh!itting all over Tempest's legacy. Sad."