Since you brought it up BCspace, what about the four year period from 1834 to 1838 when the official name of the church was "The Church of the Latter Day Saints"? I guess for that period of time, the whole "its gotta have my name on it to be mine" didn't apply. Since I found out about that tidbit, that scripture hasn't had the same umpf it once did.
The fact that it's only 2% of the Church's Latter-day existence, your "concern" barely comes up on the radar.
So..
No need for a source name because Mormons follow a church, not a person. Ok. That's new.
CFR.
The statment itself. For example...
"Not every statement made by a Church leader, past or present, necessarily constitutes doctrine. A single statement made by a single leader on a single occasion often represents a personal, though well-considered, opinion, but is not meant to be officially binding for the whole Church."
It's Jesus' church, of course. But somehow this church (a thing, not a person), may make statements that are official.
Hmm.
That's how the world operates. Companies, governments, organizations etc. follow this rule.
Who sets doctrine, the church or the prophet?
The Church.....
"With divine inspiration, the First Presidency (the prophet and his two counselors) and the Quorum of the Twelve Apostles (the second-highest governing body of the Church)
counsel together to establish doctrine that is consistently proclaimed in official Church publications."