Sounds like a reasonable explanation for then-LDS Prophet Spencer W. Kimball's Sept 30, 1978 revelation to me.
Are you ascribing your own motives to the President of the Church of Jesus Christ of Latter-Day Saints?
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Nice try, and it sounds good because you didnot give the rest of the story. Go back and tell us what Brother Joesph and Brother Brigham said about the day the blacks would hold the Priesthood. Remember, there is more then one example, so get many. Or even just a few.