Hmm, I'm not quite sure if I agree, though we agree on the fact that he's not a nice person.
I see him as a person, so ultimately focused on doing what is "right" and justifying the sacrifices that he made because he could only see them as the way forward that he has basically become an embodiment of the sunk cost fallacy, a person so dedicated to the justification of his sacrifice that he is no longer able to see that the return of the Solars might actually be a good thing.
I see his relationship to Ayesha Ura similarily to your view of it, but in a different light. Instead of "if Tammiz Ushun agrees with me now I'll have been right all along!", I see it more as a desperate attempt at reconnecting to his humanity, and a way of essentially making up to himself for what he did back then. A sort of apology if you will.
But, I can definitely see the appeal of your view, it drives the whole "not a nice person" in very efficiently.
I'll do it.
EDIT: The deed has been done.