Well I've never claimed DoDA was perfect, given how rough and tumble things have sometimes been. Warhammer in general gets plenty of retcons and such, it didn't seem like too terrible an issue to only take some of Mark of Chaos and rejigger it into the quest. Oh, and I messed up with the Eonir, that's a big one.
Either way, Jurgen was a high powered priest on a major power trip, hated a previously publicly anti-religion guy who was the character at the time, and ended up BSODing so hard that he could be wrong he tried to suicide before being turned by Tzeentch. But at the same time, I would have thought Magnus the Pious, later Frederick himself, and Magnus his son would be relatively good examples of people aligned towards Sigmar.
Either way, if anything from my quest has caused any issues here, I do very much apologize.