Ahhhh so much "doctrine" is written by silence ...think of the assumption ..and the lost tribes of Israel ....
The fact is using his logic we can not know if his "non prophets " actually did talk to God first and not record it..
The Book of MORMON contains hardly ANY LDS 'doctrine'.
It's a mere fanciful story with some bible stuff tossed in.
Any real DOCTRINE is found in the Doctrines & Covenants
I wonder why they don't give you a copy of THEM and ask you to 'pray about it'?