Board Thread:Skyrim/@comment-14027812-20130807032958/@comment-3496379-20140711115517

My headcanon is that Arniel Gane was sent to the Outer Realms (where Yagrum Bagarn was said to be during the disappearance of the Dwemer). These Realms are beyond the domain of the Aedra and the Daedra, and therefore even they do not know what goes on in these Realms.

But Arniel does. Unfortunately, his unplanned sojourn there cost him his body and his mind, and now all that's left of him to be summoned is a gibbering shade. He's in no shape to tell the Dragonborn anything, even if he wanted to.