According to Varieties of Faith, Sheogorath is born when Lorkhan's divine spark is removed. I read somewhere that Sheogorath is Lorkhan's creativity or madness. So Sheo is just an aspect of Lorkhan. Does that mean that If I mantled the one, I would also be mantling the other?

That isn't true. http://www.imperial-library.info/node/2234 said it wasn't. You gotta remember that just because it is believed by folks. doesn't make it true, especially when dealing with the mysterious Daedric Princes.

Official interview never even approached an answer to that question.

Dyus thinking the notion is funny and Haskill going on a rant about Oblivion having it's own affairs outside of Mundus isn't even approaching an answer?

Haskill cannot go more than several minutes without thinking of Mundrial affairs-the implication in his answer is that actually, oblivion is just a shadow of Mundus. Dyus' answer is hardly a yes or a no.

Even if they had given a clearer answer, remember: the interview is far from definitive. They're two denizens of the universe, and the Shivering Isles to boot, so remember bias and incomplete knowledge.

Yeah I got the feeling from that interview that Dyus and Haskill they were a bit biased. This was not something the devs came out and said directly to be true or not...

Pretty sure Haskill was just being snarky. The rest of his lines indicate that he doesn't think it's just a shadow.

Of course he doesn't, but he's wrong. He's blinded by his arrogance.

It's a bit more complicated than that but it is made clearer (or was) once we were told that Jyggalag is Sheogorath. See the guys who phrased it that way were working on limited info. They noticed Sheogorath wasn't there before Lorkhan, cool. They made the connection that Lorkhan had to be there for Sheogorath, also cool. However, people thought Jyggalag was just a ridiculous name by a troll scholar.

The point of Mundus was to allow free will and eventual transcendance for Lorkhan, accidentally (or purposefully, depends who you ask) giving it to everyone else. As one of the aspects of "Order" as shown by Jyggalag is causal determinism (different from Hermaeus Mora, god of fatalistic determinism), that everything that will ever happen in the Aurbis can be predicted by tracing cause and effect with algorithms and equations as though people were just numbers, his existence hinges on the lack of free will to resist or to make unexpected decisions. Sheogorath is what happens when free will happens, Jyggalag, his main function impossible, goes mad.

So while Lorkhan and Sheogorath are intimately and inseparably related, one is not the other.

Remember that Jyggalag blames the other Daedric Princes for him becoming Sheogorath. If he went mad because of free will, then he wouldn't say "Other Daedric Princes made me like this because I was a threat", because what reason would he have to lie like that?

My friend, you make the mistake of applying mundane logic to that which is inherently Alien. Also, just because he's temporarily not-sheogorath doesnt mean he's not nuttier-than-squirrel-poo.

Honestly, the only person whose word we have on the nature of Jyggalag is Sheogorath's.

Ego. If his curse is a divine accident, it's a lot less personally fulfilling than believing that it is because well over a dozen other gods combined considered you a threat.

How did Lorkhan's spark get removed? Was it just a by-product of creation or was it caused by the daedra, or other divine beings?

Auri-el and Trinimac got hella mad and cut him in half, flinging his heart under Red Mountain.

After said divine muscle told them to go [censored] themselves. I feel this is worth reminding people about.

Just before becoming Jyggalag, Sheogorath actually acts sane.

You thought.

Jyggalag is insane in his own special way.

Indeed.

"Insanity: doing the same thing over and over again and expecting different results" Which sums up the Greymarch imo.

One could say that, though that type of insanity doesn't lead to false memories or pathological lying.

Ahh, my friend, now you make the mistake of presuming to understand Madness! Truly, you take the first steps along the path to our Lord's realm! Hurry along now, for the Felldew tea and Alocasia tarts grow cold, and He is not known for patience.

Either way, I don't see Jyggalag as capable of lying about his transformation into Sheogorath.

My theory? Jyggalag was indeed transformed into Sheo by the creation of Mundus, but his own calculations came to the (incorrect) conclusion that the Daedric Princes did it out of fear of him, and thus he doesn't see Lorkhan as part of it at all.

My alternate theory? Lorkhan was the Daedric Prince that feared Jyggalag so much that he tried to create Mundus to defy Jyggalag's love of predestination and predictability, and the creation of Mundus succeeds in reducing Jyggalag to Sheogorath.

My alternate alternate theory? Jyggalag is just as nuts as Sheogorath, and made [censored] up.

I am inclined to believe Jyggalag. I'd take the word of a god over that of a mortal scribe any day, especially if that god's sphere is unyielding order. Can a god that is the very manifestation of linearity even comprehend falsehood? Except from a point so far above that it becomes meaningless in his eyes?

Sheogorath and Lorkhan are similar beings. Both were destroyed by their comrades and left, broken, in the remains of the world they created. Both are agents of entropy. Both are associated with a certain amount of chaos. But I do not share Mikhael Karkuxor's belief that these superficial similarities necessarily imply that Sheogorath is simply another face of the missing god. It made sense, once. But as new evidence has come to light regarding the nature of the Daedra Jyggalag, we are forced to reevaluate our conclusions, are we not?