, pondering Prior's interest in John D as of Morman stories as a defense witness.
Maybe prior thinks such a witness could counter an assertion of the prosecution. But what assertion??? Hmmmm. This is not a witness who will deny some whacky beliefs are mainstream- even if mainstream worshipers are unaware. Maybe Prior wants a witness to say Lori and Chad are not so extreme- and being that your average LDS worshipper does not murder multiple people, the prosecution's whole premise is flawed.
I think you nailed it - that LVD and CD will want to have a knowledgeable witness to counter any claim they have wild beliefs, or were trying to start a "cult," with the revelation that there are MANY such LDS sub-groups with focus on end times, future preparedness, and flexibility to embrace what they feel is being revealed to them by someone with a closer tie to God. "These guys are just one of many, doing what they all do, each in their own particular way following what they have believed is God's right way."