I'm not LDS, but as I've come to understand it, it can be explained by the whole "only opinion" thing, but another explanation relies on the nature of revelations.
Revelations in the Bible, presumably as well as with "modern prophets," are inherrantly vague and often times confusing (ie the entire book of Rev). I've always thought that the "modern prophet" can misinterpret these revelations and that's why nothing becomes official church doctrine until the apostles can pray on it and decide if it is interpreted correctly.
Maybe I'm wrong, idk.
