revealing 3 major (for my understanding) antagonists
Question: Where did you get "major"?
I mean ...
3 antagonists: Gut, Minthara, Dror Ragzlin
They all may seem like important figures in their own quest ... some people here on forum allready said they concider thwm to be main bosses of first Act.

But as the time goes on and more was revealed ... it showed that they are basically nothing but cogwheels in bigger machine.
Why do you think this is not the same?