The QM should correct me if I'm wrong, but it is important to remember that this Quest is
not canon.
The actions of the Primarchs in canon do not determine their actions in this Quest. There may be broad similarities, but citing the choices people made in canon is not evidence of the choices they will make in this Quest. Please stop using the actions of canon Primarchs to predict the actions of Quest Primarchs, as the two are not the same.
Exhibit A: Angron
What do you think?
@dptullos
I think
Yes.
I don't want to work with Malcador because if we work with Malcador then he'll be in charge. However, I suspect that he will be less than upset by our decision. Malcador likes things nice and orderly, and Curze is a mad dog.
The basic plan is to go after Curze, kill him, and then claim that Curze attacked us when we tried to reason with him. We were forced to kill him along with his Legion, such a tragedy. The great advantage to this plan is that no one likes Curze or the Night Lords. He has no friends or allies who might call for an investigation. Even if our enemies try to use it against us, "Corax and Angron put the mad dog down" is the kind of deed that gets you a medal, not a trial.
The humanitarians hate Curze because he is a monster, while the True Believers hate Curze because he is a lunatic who doesn't care about the Imperial Truth and kills people for his own amusement. We have plausible deniability, because everyone knows that Curze absolutely could go mad and attack his fellow Primarchs. Will they actually believe that was what happened? Probably not, but they also won't care.
I want to say
Yes, and Angron has to say
Yes. It's in-character for him to keep his word and put down the mad dog Curze. The question is how, and that's when it gets complicated.
Going behind the Warmaster's back will not make him happy, but if we tell him and he says
No then we would be disobeying a direct order. That would be...unwise. It is easier to ask forgiveness than permission, but the damage to his authority and our relationship could be substantial.
I'm inclined to say not; Corax approached us for help, he didn't trust Horus, and we can truthfully say that we didn't approach Horus because Corax didn't want us to. We owe him a debt of honor, and Horus will understand even if he is displeased.
In the aftermath, we claim that Curze Shot First. It might even be true!