Hi Adam,
Do you know more about the history of the Red Jaboticaba? I understood that the cross was a recent one. Are the seeds nucellar? If the Red is indeed a hybrid of two different species of Jaboticaba, and the seeds are not nucellar, it is very normal to see more diversity and variation expressed in the third, fourth and fifth generation of offspring, then in the first, or second of the original cross. This is due to the fact that any combination of genes that paired up as Xx in the original cross - X from one parent, and x from the other, always only express the big X - quality.
Only in later generations of this hybrid crossing again with itself will you see a small percentage of xx combinations surface, together with XX, Xx and xX, which will all look the same. And that goes for every different quality of the two original parents.
So I think you have a valuable little variation in your hands here. Especially if you want to do some breeding work with Jaboticaba's, it will be very useful to cross this one with other species. Because the benefit of getting crosses that have a short flowering cycle will enable you to raise three or four generations - that is three or four controlled crosses, in the time you usually can only do one. And for Jaboticaba's that is very important, since in a human lifetime for some species, you only get the chance to do three crosses.
If you can get this precocious flowering gene into other species of Jaboticaba it may save them from extinction. Just by making Jaboticaba's a more economically interesting plant.
There are also breeders who use a very precocious variety in crosses to create a new hybrid, that, once the short flowering gene has enabled you to improve the variety quickly, by selecting through three or four generations, arrive at a final plant that doesn't have to contain the short flowering gene itself. It just has better fruit and disease resistance.
Good luck!