Well, think about it. They're all Padomay-aligned, so doesn't that mean they are conected somehow with Sithis/Padomay? I think of them as "masks" or personalities to this force that does not have a personality or a consciousness as we know it, because it is beyond human comprehension.
Edit: Sort of like Satan and his demons if you will. Satan is Sithis/Padomay and the Daedra are it's demons.
I know they're not seen as demons in the lore, but still, it's kind of like that.
Wow, so much misunderstanding. First off, I'd remove the whole idea of who is Padomay aligned and who is Anu aligned, all the gods are a mix of both, ignore what the altmer tell you. The daedra are beings that did not contribute to the creation of Mundus, and live in Oblivion. In actuality, I'd say they're only changers in Mundus, but they themselves are extremely static. They're also immortal in the sense that when you kill their physical shell, their spiritual self goes to the waters of Oblivion, which is complete sensory deprevation, except the constantly feeling of ultimate cold. This is why lesser daedra align themselves with a prince, so they can be quickly taken out of the waters of Oblivion. Also, the princes are their realm, and their realm is the prince.
If you actually read my earlier post, you would know that Sithis/Padomay is NOT some sort of Satan or anything of that sort. Let me requote myself so you get a better understanding.
No, Sithis isn't some dark god of death or what have you. Instead, Sithis is the soul of Padomay, the primal force opposite to Anu. When thinking about the two, here is what it comes out to
Padomay: zero, chaos, black, the unstoppable force, etc
Anu: Infinity, stasis, white, the unmovable object, etc
Within the stasis, Sithis came in and gave it a push, and the grey maybe came. So, instead of things being infinity tall or zero tall, there is variance. Things are born, change, and die. Both aspects of stasis and chaos intertwine, which is why Sithis gets credit for being the one who started it all, as Sithis gave the initial push.
In short, Sithis is nothing more than a force, or a natural law. You cannot worship Entropy (unless it's Nurgle :chaos: ), gravity, and so on, they just are. Gravity isn't sentient, it's a force. Think of Sithis in the same light as this. Sithis isn't evil, it doesn't acknowledge, let alone care, if you slew 50 people in their sleep, and so on. The Sithis in the DB is most likely Melphala having some fun, and/or Lorkhan (as that is what the statue in the DLC looks more like, Lorkhan).
To keep it clear, Sithis is a force (lets use gravity as an example). You may worship gravity, but gravity isn't going to know or care, for it is just a force. Either way, everything will still fall at an acceleration of 9.81 m/s^2.
To end, http://imperial-library.info/content/morrowind-monomyth