If the little sunfish in question have white/light yellow borders on their lower fins, they certainly have Green Sunfish genes in them as well as Bluegill genes. See Dan "Alligator" Arnold's excellent pictures of what consensus has judged to be HBG reverted most of the way back to GSF at
"Are these Green Sunfish?" Can the offspring be hybrid?
Yes they are, what are termed "F2s" (Second filial generation, the orginal GSF-BG hybrids are F1s). They are no longer each 50% GSF genes and 50% BG genes, but rather assorted random mixes that probably AVERAGED 50/50 when the eggs were fertilized, but can range anywhere from 100% GSF to 100% BG (although the extremes at either end of this range are very unlikely). Depending on the conditions in your pond and how you manage it, either the "primarily BG" group or the "primarily GSF" group may survive the best. It is in this manner that hybrids can "tend to revert to GSF," which people worry about, or "tend to revert to BG," which usually doesn't bother anyone.
This topic has been covered a lot here, so excuse me if I repeated info you already know.