Remember all of those stories are metaphoric, there would be no tearing out of any hearts between lorkhan and anuiel because niether have hearts, Like Sithis, both Anuiel and the lessor lorkhan are more forces than they are dieties, i never read that whole story, but i ran across one about Anuiel and Sithis and lorkhan and so on. (you did mean anuiel right?)
No. Lorkhan and Auriel were as real as the Daedra. In fact, you see the avatar if Auriel, otherwise known as Akatosh (sort of), in Oblivion and Lorkhan's heart indeed rests in the Red Mountain. And Lorkhan is not the lessor, or the greater. They are equal, Lorkhan the padomaic god of Space and Auriel the Anuic god of Time. They are the flip sides of the same coin, and as such equal. They may be in fact, one in the same, one mad god.
*oh yeah, is there any hard eveidence that all of the Dwemer died out because of their attempt to gain trancendence, or could they have just obtained it, trancended reality and that's why we don't see any of em?*
Vivec says he cannot see them.