RES have bigger mouths than BG. I see nothing in the last two photos that would indicate those fish are anything but pure RES.
I think sometimes people are too quick to explain genetic variation as hybrids rather than what it is, not all fish of the same species look the same.
Yellow pectoral and anal fins in RES is more of a norm than an exception.
I believe fish 1 and 2 are in fact hybrids, most like BG x RES, but with TJ having stocked some unkown hybrids accidentally, who knows.
Fish 3 and 4 are almost certainly pure RES IMO.