Since my mind has been working overtime while I was at work, I'll go ahead and share something else I just remembered thinking of:
We know wisdom corrupts into pride, and lots of us suspect Solas has some kind of kinship with a wisdom spirit, or IS a spirit of wisdom. I was thinking, and I don't remember any of the Creators from the elven pantheon actually representing wisdom. We've got justice/vengeance, the Hunt. The closest we come to Wisdom would be Dirthamen's secrets, but secrets aren't quite the same as wisdom. I like to think that wisdom is a thing more likely to be shared.
My conclusion: Before becoming known as Fen'harel, god of rebellion, Solas was the elven god of wisdom, and perhaps also of pride.
Okay, let's break this down, because I like this.
So, first I'm going to ignore spirits and the question "is Solas a spirit?", because I don't think he is a spirit of wisdom or pride. He is far too dynamic for such a simple solution. Instead let's talk about domains. If Solas' domain was Wisdom, then it follows that he would also be about Pride, because typically that is how Pantheon gods work. For instance Athena was the Greek goddess of Wisdom, but she was so much more than that. She was Wisdom, Strategy, Courage, etc. To truly encompass an ideal, as a god would, would they not have to embody the opposite, as well? Let's look at Mythal. She is known as the peacekeeper, but as we have seen she has a burning capacity for vengeance.
So now I would like to get into what I think the gods were. We have seen many spirits in DA and they are all simple. They are not dynamic and are pointedly one-dimensional. They have a personality and an ideal and they will never surprise us. In DnD terms, they are Lawful, and yes I'd include the demons in this as well. However, the gods are surprising or, at least, Solas seems to be.
So what is my point? I think it is possible that Uthenera can only be obtained by strengthening ones spirit to a point where it can exist outside of your body and wholly in the Fade. I think to accomplish this it is necessary to embody ideals, like spirits, in order to keep yourself separate from the fabric of the Fade. Think of it as making yourself an extra strong version of yourself. However, we are dynamic. We have many ideals that make us who we are. We can be Wisdom, Rage, and Compassion all at once. So I think the gods did this to a degree that far surpassed any other immortal. Doing so would have made them crazy powerful and possibly crazy.
Anyways, yes, I could see how Fen'harel could have been Wisdom and Pride and a few other things as well, probably. Or it could be the corruption that everyone is always talking about. The thing I love about DA is that so many varying theories are valid, because it is such a rich universe.