Just my two cents ...
The link to the images of Dr. Bruce's
BGxRES has a corresponding thread right
here in the Pond Boss Forum. Dr. Bruce documents how he cultured the hybrid and we can be certain there is no PS or OSS in his hybrid.
They look pretty much the same. Shorty catches both BG and RES in this lake but has yet to catch a PS or OSS. Isn't the simplest most reasonable identification the one Shorty originally posted?