@Miko Hacksaw - I don't have time to respond to all of that and this is enough of a mess already. It'd be safe to say that my stance on the outcome of the fight itself is aligned with Temp's here.
The main thing regarding our personal discussion is that his hunger is dark side oriented. It's confirmed by the Onderonians to be an echo in the Force (not just casting echoes in the Force), and the Prima Guide confirms that he uses "only the dark side". I did mention this in a prior post that you didn't respond to, but I'll say it again: those quotes prove beyond doubt that his hunger is in no way independent of the Force. It isn't a separate or external source of power; it's a subset of the Force itself.
The fact that his hunger is sated or fueled by the Force doesn't establish it as separate from the Force altogether. Indeed, things that damage or drain the Force, or are powered by it, have historically included acts of the Force or Force powers themselves. From where I'm standing, his hunger is the "Force Drain" that I call it, but also doubles as his condition. How can the Force influence someone who's a Wound in the Force? The same way you proposed that Kreia and the Exile regained their connections to the Force upon meeting despite both being cut off from the Force and one being a Wound in the Force.
To reiterate, his hunger is a dark side condition/dark side Force power, not a separate source of power from the Force altogether. Your use of this quote:
Nothing matters except his hunger. Before it devours him totally, Nihilus uses its power to displace his persona into his robes and armor.-- Knights of the Old Republic Campaign Guide
Is taken completely out of context, I'm afraid. The KotORCG itself uses "the dark side" synonymously with "hunger" here, which only supports my point:
As Nihilus greedy consumes entire planets life energies, the dark side macerates him even faster.-- Knights of the Old Republic Campaign Guide
And that's hardly the only quote to do so:
Darth Nihilus is so corrupted in the Dark Side that his very speech causes pain and death to all who hear it.-- Knights of the Old Republic II: The Sith Lords Prima Official Game Guide
The Prima Guide reiterates it as well. I think it's clear that "hunger" is really just a synonymous term for Nihilus' "dark side condition/power" (it's both). In reality, his hunger is really just the "Force Drain" that I and several others like to refer to; the thing is that it's not just a power but also doubles as a condition or disorder, if you will, and I'm sure you can understand why; the more he uses it, the more it takes over him. There's another quote that talks about how his hunger "drives him" to consume populations; that is yet more evidence in favour of my interpretation. And indeed, when you do the same thing as you kill the Jedi Masters in the DS storyline, Kreia explains that this power is of the dark side, not distinct from the Force in any way:
"It is something the Sith, the assassins that stalk us, can do- it is of the dark side, the ability to feed on life, the Force, the closer one comes to it. It makes them stronger - for a time."-- Knights of the Old Republic II: The Sith Lords
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Nihilus has been thoroughly established as a dark sider, someone who wields dark side power, someone with a connection to the dark side, and someone corrupted by the dark side. That fills the criteria for him to fall under Palpatine's quotes (since we know him to be a Sith Lord). In that case, Palpatine is indeed more powerful, and Temp's case indeed continues to hold credence.