Im not denying anything happened, I question the validity of presenting a detail of events as fact.
While I do agree that it is very likely that the CoC mantled Sheogorath, it is the most plausible theory,
I just dont agree it is 'canon fact.'
I hope that youre wrong about Jyggalag though, I would hope to see him in a future DLC or something.
Well... semantically Shivering Isles is an "expansion", which tend to have the attribute of "canon". It's not a sequel, yes, and nowhere in Skyrim has the fact that "CoC is Sheogorath" has ever been mentioned
But seriously, how are you going to say that in the game anyway? In the Sheogorath-approved way?
It'll be VERY awkward, is how it will be. They can't specify gender, age, race, equipments, or such. They CAN have Sheogorath claim he's the CoC, though, but given that he's the Daedric Prince of Madness, you can't really be sure either
As for Jyggalag, I'm pretty sure he's gone for good. He was badass, yes, as are the other Ultramen, but as you can see there is nary an acknowledgement in-game. It is possible that nobody knows who Jyggalag is based on the fact that everything happened not in Tamriel, but in Shivering Isles, but that only makes Bethesda's job at getting rid of him easier
Well, perhaps someday Bethesda will pull itself together and call Jyggalag again, but he certainly won't be in Skyrim. After all, you can only dish out so many DLCs before making The Elder Scrolls VI: Aldmeri Diminion