I've been writing my own sequel to the events of DAI/Trespasser to fill the time, which is why I keep coming back to see what other people think how certain things are going to resolve themselves. It will be interesting to see who, if anybody, is right.
Anyway, I was having my Lavellan recount the story of Elgar'nan to Dorian and at the end he says, "How could such a story of forgiveness and reconciliation come out of the society that Solas depicts?" So Lavellan says that perhaps it was just a fanciful tale that the Keepers made up to fill the gaps, to which Dorian replies that it was a much better one than the humans came up with.
If you think about it, amid all the negativity about the Evanuris, the story that the Dalish Keepers tell if nothing else reflects well on them. Because the story is about a family warring among themselves, then reconciling and forgiving, and then becoming unified once more. Let me remind you of it in full:
In the beginning there was just the earth and the sun. The sun bowed its head to touch the earth and there Elgar'nan was born. They both loved Elgar'nan but the earth produced beautiful gifts of plants, birds and animals for his delight. Then the sun grew jealous of the regard he gave to these gifts and burnt them to ashes. Elgar'nan was furious and fought his father the sun, finally burying him in the Abyss. The earth wept tears for all that had been destroyed and from these the oceans were created. Mythal was born of the sea. She calmed Elgar'nan's anger and persuaded him to forgive his father. The sun was released and together with the earth, helped Elgar'nan and Mythal restore all that had been lost.
It is clearly a story about the value of family and coming together and remaining loyal to one another despite any differences that might arise. Contrast this with the story of the Maker, who creates the spirits, gets frustrated with them because they do nothing but praise him, creates another set of creatures to be nothing but creative and industrious and gives them a world suitable for this. Gets upset because they forget him and gets upset with the spirits for finally taking an interest in something other than him. Spirits are jealous of men, the Maker is angry with spirits and men, because the latter were interested praising something other than him. He punishes them all and then goes off and sulks. Very edifying.
So regardless of what the Evanuris may or may not have been at the end, what the Dalish recount of their beginnings is nothing to be ashamed of and in fact not really contradicted by anything we have learned, since initially they were just leaders at a time when the people needed them to be. The Dalish faith at its heart is about unity, family, reconciliation and forgiveness. Be proud fellow elven.
Incidentally, my Lavellan also recalled that the stars were the life blood of the sun, spilled during the fight. Since they were the result of Elgan'nan's anger at the destruction of his world, he has decided they should be symbolic of his struggle to prevent Solas from destroying his own world. Every time he looks up at the night sky, he remembers what is at stake.