Sounded a bit more like resent then respect.

I don't know about a romantic link between Zargabaath and Drace, they just don't seem suited. Whilst Drace openly speaks against Vayne and makes it no secret that she thinks him an unwise choice of leader, Zargabaath is very differant. He may not support Vayne, but he certainly dosn't voice his concerns, and follows his orders without question.
I doubt that Drace would have the tolerance for such a man. She likey sees him as a sniveling lap-dog, and he sees her as unwise for protesting as she does.
However, the do share ideals, and morally are on the same 'side', so they are sort of allies.