As much as love complex theories - I am 100% with you. Not a fan of "shoving the story/lore up its own butt because it's deep?"(I'm giving the side-eye to you Bioshock). I like when people who should know better screw up. I like doubt. I like when people are corrupted by power. I like redemption. I like the game's discussion of faith and how it can be manipulated. Makes the story fun.
I hope Solas is nothing but a super mage or some Abelas+ because at the end, you can actually talk to him. He's still a person and it makes sense that he would have person-like emotions and you can actually convince him what he may be doing is wrong. When you make him some a super-god imbued with the soul of 3 different gods it becomes less logical that he would actually be more "human". There would be no saving him. He would/should have no care for 'mortal' concerns.
Er. No. No, no- he's not "three gods". At least, not in the way you're conceiving it. He is, and has always been, Solas. Stubborn. Probing. Idealistic. Great fade-kisser. Same guy, all through the ages, right up until the present.
It was only his representation in the Panthon that changed. The "Gods" of the elvish Pantheon were like masks for the actual, real mage-rulers that used them. They were a face to present to the rest of Elvhen society: at first to their subjects, then later to their slaves and worshipers as initial deference to the Pantheon's political authority warped over the ages into demands for absolute obedience and worship.
Saying Solas is Fen'Harel, the Dread Wolf, and Falon'Din/Dirthmen does not make Solas greater than he is. It doesn't give him magical "god" powers. It simply tracks his history through the ages in terms of the Pantheon and his place in it via myths, the only scraps of twisted history that have survived.
Make sense?