I am so sorry if this covered already, but there is so much here it could have gotten buried. In the initial post in this thread, one of the things talked about is the theory that Mythal summoned or called Solas to help her -- he ended up bound to her and THIS is how he became Fen'Harel. The title of wolf was meant more as dog, or canine. Mythal's dog.
He said that he "was Solas first, Fen'Harel came later."
Could Solas have been a wisdom spirit summoned and bound by Mythal? If so... could that be part of the reason he gets so deeply upset about the spirit in his personal quest? His biggest issue is clearly forcing an entity to act outside of it's purpose, thus corrupting it.
Was Solas a spirit, "corrupted" into a demon, the Dread Wolf?
He was proud to serve Mythal ("A title I foolishly wore as pride, inspiring hope in my friends and fear in my enemies") in the beginning-- but now he has realized he is just a servant like he so detests? He has got to see the hypocrisy here.
He is affectionate to her when they meet. This could be a display of fierce loyalty (At first I thought they were lovers, ala Andraste and Shartan) but if you watch the scene thinking of Solas as a "guard dog," it seems more appropriate. The way she touches him and his reaction-- it's affectionate but almost resentful. Or maybe it could be a bit of Stockholm syndrome.
Also, looking at him through this lens of "loyal without a choice guard dog" makes his character make a lot more sense, IMO. This even fits the Solas/Shartan/Flemeth/Andraste theory.
TLDR version - is Solas a wisdom spirit summoned and bound by Mythal? Does this explain his explosive reaction on his personal quest? And if so, is that why he was "Solas first" and became the Dread Wolf (Mythal's dog?)
This has been discussed before and since you messaged me personally I'll just leave you with an analogy I found interesting (since you've read my OP and pretty much know my thoughts on the subject).
Also the Evanuris (based on Solas' on admissions) seem to be the ones to have used Fen'Harel as a slight or slur regarding Solas' relationship with Mythal (as her protector/"guard dog").
"A title I foolishly wore as pride, inspiring hope in my friends and fear in my enemies"
Solas never actually says he foolishly wore the title with pride. Here are the actual quotes.
Now here is the analogy I found interesting that I mentioned up above
Codex entry: Andraste's Mabari
And there's Andraste's mabari (Mythal's Fen'Harel)
By the Holy Prophet's side.
In the fight against Tevinter, (slavery, the Evanuris)
That dog would never hide.
They say the Maker sent him special, (Fen'Harel became revered as a god and must have been special in the eyes of Mythal)
Always loyal, without pride, (Solas was loyal but prideful)
So he could be the sworn companion (Of Mythal)
Of the Maker's Holy Bride.
Oh, that dog, he guards Andraste (He guards Mythal)
Without arrogance or fear, (Solas is arrogant and was plagued with fear of what would happen if the Evanuris were left unchecked)
Only asking of his mistress
Just a scratch behind the ears.
But then old Maf'rath gets to plotting,
Tries to lure that dog away.
But even as they trap the Prophet, (but even as they Kill Mythal, freeing him of her influence)
Her mabari never strays. (Solas stays true to her convictions, her goals)
I'm not implying Andraste was Mythal here by the way, I just find the parallels interesting in regards to the relationship between Mythal and Solas.
http://dragonage.wik...draste's_Mabari