Le Roy Snow offers premortal explanation for certain classes.
"Tabernacle Services," Logan Journal, December 19, 1895, 3
Some will ask why are certain classes, such as negro, discriminated against, and why will they not receive the same degree of glory as others? The reason is that they did not keep their first estate equally well, they stood in inferior rank in heaven, as is their case here, obedience in heaven guaranteed earthly privileges, just as earthly obedience will in turn guarantee heavenly blessings. We cannot always tell who are the blessed of God. Sometimes we are deceived as to some who appear to be blessed.