Not sure where to put this as it kind of has something to do with both Skyrim and Morrowind.
Red Mountain blew its load....anyway. We go to Solstheim to fight Miraak and we come across Ash Spawn and undead that had been at the mountain.
Is it possible the Nerevarine was not able to kill Dagoth Ur as only dumping him and the heart off into the bottom of the volcano?
I mean, Dagoth Ur did still have his divinity as a god. So, its probably likely he was able to take the heart, as he was drawing power from it.
Is it likely he's still very much alive and with Lorkhan's divinity?