From where I stand, I see the Abyss as being a largely negative mechanism in the game (e.g., it corrupted Artorias, Kaathe lives there and he's responsible for the corruption of New Londo kings, etc.), but when presented with the option to talk to either Kaathe or Frampt, Kaathe seems to have the implied "Age of Man" as his motive for selection (whereas Frampt wants you to link the fire and continue the age of the gods). This could just be me, but if Kaathe is for humanity and against the gods--which is safe to assume judging by his rivalry with Frampt, who was Gwyn's buddy--why is he kicked back, chilling in the Abyss? Maybe we're not meant to trust him and in not linking the fire, you usher in an age of darkness consistent with the Abyss (wildly speculating now)? If someone could give me some insight, it would be greatly appreciated.
Another concern of mine is the 4 kings and the Darkwraiths, and the role of the sealers. Going from the standpoint that Kaathe is "good" (assuming player sentiment towards a human-dependent society detached from the gods), how did he "corrupt" the 4 kings? Or was that just the Abyss that he happens to dwell in? And the darkwraiths--even after forming a covenant with Kaathe, they attack you. Going off of that, I can assume a couple different things, but here's what I'm thinking currently: The Abyss was responsible for the corruption of the 4 Kings of New Londo. Kaathe is responsible for the Darkwraiths. Somewhere along the line, the Darkwraiths go rogue (hence explaining why they attack the player whilst in the same covenant--perhaps they do not feel they are bound by it), and the sealers, seeing the potential for destruction, agree to flood the previously-contained New Londo. And the sealers--where did they come from, and why didn't they act when the Darkwraiths were first presented (or did they, or does anyone even know?)
All that speculation aside (and believe me, I'm guessing a lot--I'm somewhat new to this whole lore thing, so please don't jump on me too hard if I'm wrong!), I still don't fully understand why Kaathe would be volunteering to help the player if he's allied with the Abyss and such. Yes, perhaps he's simply looking to human weakness in order to achieve an ends which he would find suitable (in other words, he's tricking you), but I feel like everything he says makes sense in conjunction with the beginning cutscene (about the Dark Soul, the pygmy, etc). It all seems quite suspect in the end though, so I'm not sure what to think. Any feedback would be greatly appreciated, and I apologize in advance for this overlong post!
-Jack