I think this point is exactly what that Storms! was referencing in her original post. T is allowing Odium to think he has the upper hand and that T is going to be influenced and act as an agent of Odium (hence the Snape comparison). I believe T is sincere in trying to save the entire world and he is attempting to achieve that by giving the appearance he only is trying to save Kharbranth.
One a side note....damnation you Sanderson! Take my money...take all of it!