...so you are not just a Primarch but your world's version of the Emperor himself.

[This is a LOT for his tiny brain to take on. Please have patience.] Why would you refuse your responsibilities? [Not blaming just asking. ]

[Well, this is inconvenient. He was counting on you to know these things. ] I do not know either. How can we be sure they are not contaminated by Slaanesh's vile touch?

My kind is also immune from disease, save those of the God of Pestilence himself. Sometimes. [or so he thinks]
This proves nothing other than that they do not--yet--have total control over anyone here.