Istvan Toth and Markvart von Aulitz

At the end of the game Henry says this ''I’d rather find that whoreson who murdered my parent, get the sword back from him and skewer him with it!, But the thing is Markvart von Aulitz killed his parents and Istvan Toth has his sword. Maybe Istvan Toth and Markvart von Aulitz were supposed to be one character. It would make sence because Markvart von Aulitz appeared only in the prologue. Istvan Toth appears to be more the main villain. I just find it odd that Henry talks about them as one person.