If atoms are shrinking over time (not such a leap of imagination, as atoms are mostly empty space), then all redshift is easily explained by the increasing distance between galaxies, instead of 'expanding space'. Again, according to big collapse theory, space does not expand, it is only an illusion created by galaxy shrinkage relative to each other.

Prediction: If we can observe other lunar objects around other planets, such as the two moons of Mars, moving away from Mars at the same rate/size as the moon is moving away from the earth, this would indicate a constant of atomic shrinkage. This is a prediction that could be observed within several years.