they take "achievements" more seriously than the lore?
that would be sad... and if it was true... why bother having us deal with mehrunes dagon again if we defeated him in battlespire?
mannimarco is supposed to be a mighty lich... not a mortal altmer.
look at this quote from UESP...
He became the first lich (explaining his longevity, as he was approximately 1,130 years old by the beginning of the Oblivion Crisis).[1] It is not specified if he was the first lich ever or the first humanoid to make the transformation. He lost his body and mind; he became a living, moving corpse. His blood became acid, and all manner of repulsive things happened to him.
and look at this image of him from daggerfall...
http://images.uesp.net/5/59/DF-King_of_Worms.png
...im sorry, but we need this mannimarco as an opponent either in skyrim or a later game, because there is no way in hell that altmer was the real one.
if we can find dagon twice, we can fight the REAL mannimarco after killing a random minion of his who decided to use his name.