I am guessing a BGxBGxGSF as in a sunfish that is 3/4 BG, 1/4 GSF. Although it maybe a rare female BGxGSF hybrid.
It maybe a RESxGSF as you said, but I am thinking it is more likely just a BGXGSF. The red or orange on the opercle is often times seen in a pure GSF and may just be particularly strong in this fish.
Looks like a pure BG to me.
Like the first pic, I am guessing a BGxBGxGSF as in a sunfish that is 3/4 BG, 1/4 GSF. Although it maybe a rare female BGxGSF hybrid but since their are two of them now, more likely the BGxBGxGSF theory...