From my understanding they are just... some, perhaps more important, but still pawns to the real antagonst so I'm not that shocked.
I expect more twists and turns in the story if they make such reveals.
I really do hope there will be twists in the story that will leave us in awe.
But still, revealing 3 major (for my understanding) antagonists is really off putting. I don't mind side bosses, but main ones for each act? That's too much.
I want to expect the unexpected. I wish for thrill in finding out who the f is pulling the strings.
I don't want it to be something in lines of "Hey! We are going to save Rivellon, oh and guess what? Lucian is alive!"