I think when people use the word "Revert" they are saying that a seed from a tree that yields dark fruit, when planted, resulted in a tree that yields red fruit.
Plant 100 seeds from that dark fruiting plant. Grow them to maturity and you will likely see some diversity in the fruit color.
X% Reds and X% Darks.
Maybe X% In-betweens and possibly a few Mutants with retractible claws!
Cull for the best fruit characteristics and start grafting the ones you prefer.
I have no idea what the dominant fruit color trait is in Uniflora.
Dark fruit may be a recessive trait.
Bring on the Botanists!
Kevin Jones