Greg :

To keep it straight in my mind I divide this topic in 2 parts for genetic purposes.

Part One -- each type BG , GSF and HBG are a separate thing, each with their on genetics , traits, abilities, benefits and problems. Each separate and different .

Part two -- HBG are a cross (a genetic change) and as such have the potential for both hybrid vigor and outbreeding depression. Both of these are present in HBG. Big mouth - fast growth start and most important aggressive (easy to catch) and skewed sex ratio in the F1 cross. As time , generations pass outbreeding depression works to lessen hybrid vigor and can (may) lead to offspring that have traits worse than either parental species. In time they may become "unwanted" but not because they are BG or GSF (or seem to have their traits) but because they are Fx HBG that have experienced outbreeding depression and the resulting negative genetic traits.

Recall that small size and/or stunting/ overpopulating is common to a number of lepomis not just GSF. I know that one or more of these traits are common in GSF , PS , BG , and others as well.

ML has GG and I don't know if they are HBG or not. Yes you can have different %s of parental species gene sequences ( BG , RES and GSF for example) but its how they mix and match up (if they are viable/live) that counts. To my knowledge science does not know ( I have not seen it written) what traits come from where and in what % and combinations with HBG or other lepomis crosses. Much left to learn. That is why I am interested in DIED's HBG situation -- are they continuing F1 HBG or are they Fx HBG.

I hope this helps somewhat.