Dear Brother John,
Please, understand that i have no way to have any knowledge about your questions. from your posts i can see that you are hardly content with interpretations and look for the truth, so i don't think what i can tell you will be something more than personal view, if this will have any value for you. I have no other source of information except the Murli and the Murli clarification, and little BK literature i have read. I don't have access to any hidden sources and any hidden knowledge, that is not common to all. All I know is already this that is well known to all.
I don't undertsand completely what do you mean with divine decrees being genuine. If you ask whether i think there is genuine knowledge in them yes. If you ask whether i think they are genuine documents and not falsificates yes.
I also don't understand what do you mean with that Virendra Dev Dixit has made a mistake. Which mistake he has made that you mean. If you mean about that there is no literature from the beginning of the Yagya i think as Arjun Bhai that Baba via Virendra Dev Dixit means the very early days, before Karachi. As you also know by my posts I am not impartial regarding The Knowledge given through Baba via Virendra Dev Dixit, so i cannot give you an impartial answer to the question
Do you think Veerendra Dev Dixit could have made a mistake?
Although at some places i feel astonished by The Knowledge he gives, my pursuit is to think it out well before i condemn. I am surely convinced considerable part of the distance created by The Knowledge is due to some suspisiosness - a quality i have no need to possess. For my own safety i have chosen to open up and abandon the distrust to only one source, because based on my past experiences i have come to conclusion that all are givers of sorrow. Ultimately, I try to accept whatever he says.
I have no idea about the third question. I personally am not interested in this issue. For you who are interested i can say that the question put in such a way and a research made in this direction can find some proof somewhere and the answer may com as such and such an year. For me this information is not of any value.
I think as a whole this whole process is not done with the real desire for to know a reality, but to dismagify (from magic - to remove the magic) from something covered by the cover of magic of God's work and present it as occult, cultural, social, economical etc phenomena rather than Godly and spiritual phenomena. In fact, i think this is not your pursuit but rather ex-l's whom you follow.