I think Nohadon's soul is still around. The idea of him if you will but not his conciousness. I am not even 100% sure that he wrote The Way of Kings or that everything in the book literally happened to him. As Taravangain points out some of the stories or too neat or simple. At this point he is probably an arthurian figure. I think Dalinar is looking into the SR seeing Nohadon's soul and his mind is placing this in a context that he can understand and relate to. Warbreaker
Dalinar is looking for his role model. His ideal king, leader, and radiant.